Learn Hardcore German: Bitte buchstabiere deinen Namen.

It’s the informal singular imperative (addressing one person with du) of the verb buchstabieren “to spell.” The pronoun du is normally omitted in imperatives: (Du) buchstabiere …

Why does it end in -e? Could it also be “buchstabier”?

Yes. The du-imperative can appear with or without the final -e:

Buchstabiere deinen Namen. (more common in writing)
Buchstabier deinen Namen. (very common in speech)

Both are correct; with verbs ending in -ieren, keeping the -e is especially common.

Why is it “deinen Namen” and not “dein Name”?

Because Name is masculine and it’s the direct object (accusative). With masculine nouns, the possessive dein- takes the ending -en in the accusative:

masculine accusative: deinen Namen
feminine accusative: deine Adresse
neuter accusative: dein Handy
plural accusative: deine Unterlagen

Why is it “Namen” and not “Name”?

Name is a “weak” (N-) noun. In the singular it adds -n/-en in every case except nominative:

nominative: der Name
accusative: den Namen
dative: dem Namen
genitive: des Namens

With a possessive, it’s still accusative: deinen Namen.

Where can I put “bitte,” and does the position change the tone?

All are fine; tone shifts slightly:

Bitte buchstabiere deinen Namen. (neutral–polite; common)
Buchstabiere bitte deinen Namen. (neutral request)
Buchstabiere deinen Namen, bitte. (tagged-on “please,” a touch more insistent or coaxing)

No comma is needed in the first two. A comma before a final bitte is optional if you treat it as an afterthought.

Is the sentence formal or informal? How do I say it formally?

It’s informal (du). The formal version is:

Bitte buchstabieren Sie Ihren Namen.

Note the verb form buchstabieren with Sie, and Ihren (capitalized) for the formal “your.”

How do I say this to more than one person informally?

Use the ihr imperative and eur-:

Buchstabiert euren Namen, bitte.

Note the spelling change: euer → euren (the stem eur- + ending).

Can I turn it into a softer question?

Yes:

Informal: Kannst du bitte deinen Namen buchstabieren?
Formal: Könnten Sie bitte Ihren Namen buchstabieren? (even more polite with “könnten”)

How do I ask specifically for first or last name?

Bitte buchstabiere deinen Vornamen. (first name)
Bitte buchstabiere deinen Nachnamen / Familiennamen. (last name) Formally: … Ihren Vornamen / Nachnamen.

How do I pronounce the sentence naturally?

Bitte: short i and e; roughly “BIT-te.”
buchstabieren: “Buch” with the harsh German ch (like in “Bach”); the “st” here sounds like “sht”; stress on the “-bie-”: buch-shta-BIE-ren.
deinen: “ei” like English “eye.”
Namen: long first “a”: “NAH-men.”

Why is the verb second after “Bitte”? Isn’t the imperative verb-first?

Without bitte, imperatives are typically verb-first: Buchstabiere deinen Namen. When you place bitte at the start, it occupies the first position and the finite verb follows (German verb-second rule): Bitte buchstabiere deinen Namen.

Is “buchstabieren” a separable verb? How do I form the past?

It’s not separable. The past participle is buchstabiert, and the auxiliary is haben:

Ich habe meinen Namen buchstabiert.

Is there a standard way to spell out names in German (like “A as in Alpha”)?

Yes, Germans use a spelling alphabet (Buchstabieralphabet). You’ll hear traditional name words (e.g., “A wie Anton”) and, in newer standards, city names (e.g., “A wie Aachen”). In real life, people often just choose any clear word: “M wie Musik, A wie Auto, Y wie Ypsilon …”. The key is clarity; any unambiguous word works.

Do I need a comma after “Bitte” at the beginning?

No. Write Bitte buchstabiere deinen Namen. without a comma. A comma is only used if bitte is a separate interjection set off by a pause, which is less typical here.

Why is “Namen” capitalized?

All German nouns are capitalized: der Name → den Namen. Adjectives and possessives like deinen are not capitalized (but formal Ihren is capitalized because it’s the polite pronoun).

What’s the difference between “buchstabieren” and “schreiben”?

buchstabieren = to spell (say the letters): “Kannst du deinen Namen buchstabieren?”
schreiben = to write: “Schreib deinen Namen hier.” These are not interchangeable.