〜人: Counting People | Japanese Grammar

Counting people uses the counter 人 (にん) — but the two most common counts, "one person" and "two people," are famously irregular: they aren't ichi-nin and ni-nin, they're 一人ひとり (hitori) and 二人ふたり (futari). From three on, everything settles down to the regular にん series. The good news is that these two irregulars aren't arbitrary noise to be brute-force memorized — they come straight from the native number roots ひと- and ふた-, the same ones behind ひとつ and ふたつ. Once you see that connection, the irregularity becomes a story instead of a burden.

The full series

Written	Reading	Meaning
一人	ひとり (hitori)	1 person — irregular
二人	ふたり (futari)	2 people — irregular
三人	さんにん (san-nin)	3 people — regular
四人	よにん (yo-nin)	4 people — irregular reading (yo, not shi/yon)
五人	ごにん (go-nin)	5 people
六人	ろくにん (roku-nin)	6 people
七人	しちにん (shichi-nin)	7 people (also ななにん)
八人	はちにん (hachi-nin)	8 people
九人	きゅうにん (kyū-nin)	9 people
十人	じゅうにん (jū-nin)	10 people
何人	なんにん (nan-nin)	how many people?

So there are exactly three things to watch — 一人 (hitori), 二人 (futari), and the reading of 四人 (yonin) — and after that the counter is beautifully regular: go-nin, roku-nin, jū-nin, nan-nin. Unlike 本 or 匹, the counter 人 (にん) begins with an n and triggers no sound changes at all, so there's no jup-pin or sanbin to worry about.

今日のパーティー、何人来るの？

kyō no pātī, nan-nin kuru no?

How many people are coming to today's party?

うちは五人家族です。

uchi wa go-nin kazoku desu

We're a family of five.

Why 一人 and 二人 are irregular — the native connection

The irregular pair isn't random. Long before Chinese numbers arrived, Japanese counted people with its own native roots plus an old people-suffix 〜り (り): ひと-り ("one-person"), ふた-り ("two-people"). Those two survived intact; everything from three upward was replaced by the borrowed Sino counter にん. So the "irregularity" is really a fossil of the older native system — and you already know its number roots:

Native root	Objects (〜つ)	People (〜り)
ひと-	一つ (hitotsu)	一人 (hitori)
ふた-	二つ (futatsu)	二人 (futari)

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Don't memorize 一人・二人 as isolated exceptions. See them as the same native roots ひと-/ふた- that give you ひとつ/ふたつ, just wearing the old people-suffix 〜り instead of 〜つ. The irregularity has a reason, which makes it stick. From three on, the native system gave up and Sino にん took over — exactly as objects switch from native to Sino above ten.

一人で映画を見に行くのが好きなんだ。

hitori de eiga o mi ni iku no ga suki na n da

I actually like going to see movies by myself.

週末は二人でどこか出かけよう。

shūmatsu wa futari de dokoka dekakeyō

Let's go out somewhere, just the two of us, this weekend.

Notice the bonus meaning: 一人 (hitori) doubles as "alone / by oneself," and 二人 (futari) as "the two of us / a couple." 一人で = "alone," 二人で = "as a pair." These are among the highest-frequency words in the language, which is all the more reason to lock the readings in early.

四人 is よにん, not しにん

The subtle trap. The number four has two readings, し and よん — but with 人 it takes neither of the ones you'd guess. 四人 is よにん (yo-nin), using the short reading よ.

The reason to be careful is more than pedantry: reading 四人 as ×しにん collides with 死人 (しにん), "a dead person / corpse." Japanese pointedly avoids し for four in human contexts, and 四人 = yo-nin is the fixed result. (You'll see the same よ in 四時 yo-ji, "four o'clock.")

予約は四人でお願いします。

yoyaku wa yo-nin de onegai shimasu

A reservation for four people, please.

教室に四人しか残っていなかった。

kyōshitsu ni yo-nin shika nokotte inakatta

Only four people were left in the classroom.

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Four with 人 is よにん (yo-nin) — not しにん (which sounds like 死人, "corpse") and not よんにん. The reading よ also drives 四時 (yo-ji, four o'clock) and 四日 (yokka, the fourth). When people are involved, four is almost always よ.

名 — the polite counter for people

In formal and service settings — restaurants, hotels, business — people are counted not with 人 but with 名 (めい) mei, often followed by 様 (さま): 三名様 san-mei-sama, "a party of three." This is the register you'll hear the moment you walk into a restaurant.

何名様でいらっしゃいますか。

nan-mei-sama de irasshaimasu ka

For how many (guests), please?

七名で予約したいのですが。

shichi-mei de yoyaku shitai no desu ga

I'd like to make a reservation for seven.

名 (formal) uses the plain Sino readings throughout — 一名 ichi-mei, 二名 ni-mei — so it has no ひとり/ふたり irregulars. That makes it, in one sense, easier; but it's restricted to formal/business contexts. In everyday speech you stick with 人 and its irregular pair.

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Two registers for the same job: 人 (にん) is the everyday counter (with irregular 一人・二人), while 名 (めい) is (formal) — restaurant reservations, guest lists, official headcounts. When a server asks 「何名様ですか」, they're using the polite counter; you can answer 「二人です」 in casual style or 「二名です」 to match their register.

Talking about group size

Once you can count people, a small kit of related expressions makes you sound natural. The reduplication 一人一人 (ひとりひとり) hitori-hitori means "each individual / one by one," and 二人とも (ふたりとも) futari tomo means "both (of the two)"; the pattern extends with とも: 三人とも "all three of them."

一人一人に丁寧に対応したいと思っています。

hitori-hitori ni teinei ni taiō shitai to omotte imasu

I want to respond to each person carefully, one by one.

二人ともまだ来ていないみたい。

futari tomo mada kite inai mitai

It seems both of them haven't arrived yet.

For sizes rather than exact counts, Japanese uses 大勢 (おおぜい) ōzei ("a large number of people, a crowd") and the paired 大人数 (おおにんずう, "a large group") / 少人数 (しょうにんずう, "a small group"). Note that 大勢 is only for people — you can't use it for objects.

駅前に大勢の人が集まっていた。

ekimae ni ōzei no hito ga atsumatte ita

A large crowd of people had gathered in front of the station.

Fossils and idioms

The native 〜り suffix froze into a few higher counts that survive as (archaic/literary) fossils — worth recognizing but not for active use: 三人 could once be みたり and 四人 よったり in old and dialectal Japanese, but modern standard Japanese uses さんにん / よにん. One idiom keeps the にん series alive in a set phrase:

十人十色だから、みんな考え方が違って当然だよ。

jū-nin-toiro dakara, minna kangaekata ga chigatte tōzen da yo

It's 'ten people, ten colors' — of course everyone thinks differently.

十人十色 (じゅうにんといろ) jū-nin-toiro, literally "ten people, ten colors," is the Japanese "different strokes for different folks" — a nice, memorable home for 十人 jū-nin.

Common mistakes

❌ 一人 = いちにん、二人 = ににん

Incorrect — regularizing the native irregulars to the Sino pattern.

✅ 一人 = ひとり、二人 = ふたり

hitori, futari

one person, two people — the native readings.

The classic beginner error: applying the にん pattern to one and two. They are ひとり and ふたり, from the native roots.

❌ 四人 = しにん

Incorrect — しにん collides with 死人 (corpse); four with people avoids し.

✅ 四人 = よにん

yo-nin

four people — read with よ.

Four with 人 is よにん, never しにん (and not よんにん).

❌ 大人が三人 → 「おとな」を「ひとり」と混同

Incorrect — 大人 (otona, adult) is a noun, not a form of 一人.

✅ 大人が三人と子どもが二人います。

otona ga san-nin to kodomo ga futari imasu

There are three adults and two children.

大人 (おとな, "adult") looks like it contains 人 but is a separate word — don't confuse it with the counter. Adults are still counted 一人, 二人, 三人.

❌ お客さんが五個来た。

Incorrect — people are never counted with 個 (small objects).

✅ お客さんが五人来た。

okyaku-san ga go-nin kita

Five customers came. — people take 人.

Never count people with an object-counter like 個 or 〜つ. People always take 人 (or, formally, 名).

Key takeaways

People are counted with 人 (にん), which triggers no sound changes.
Two irregulars: 一人ひとり and 二人ふたり, both from the native roots ひと-/ふた- (the ひとつ/ふたつ family). They also mean "alone" and "the two of us."
四人 is よにん — never しにん (= 死人, "corpse") and not よんにん.
From three up, all regular: 三人, 五人, 六人 … 十人, 何人.
Formal contexts use 名 (めい) — 三名様 — which has no irregulars but is restricted to (formal) register.

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