Ea se numește Ana.

Ea means she.

In Romanian, subject pronouns are often left out because the verb ending already shows the person. So:

• Ea se numește Ana. = correct
• Se numește Ana. = also correct and very natural

Including ea usually adds emphasis or clarity, for example if you are contrasting people:

• El se numește Mihai, iar ea se numește Ana.

So yes, ea is correct, but it is not always necessary.

Se is part of the Romanian verb a se numi, which means to be called / to be named.

This is a reflexive verb in Romanian. In this sentence, se numește is the normal way to say that someone has a certain name.

So the sentence is built like this:

• ea = she
• se numește = is called
• Ana = Ana

You should learn a se numi as a whole verb, not as a numi plus an optional extra word.

The base form is a se numi.

Numește is the 3rd person singular form, used for:

• el = he
• ea = she
• sometimes a singular noun as the subject

So:

• Eu mă numesc ... = I am called ...
• Tu te numești ... = you are called ...
• El/Ea se numește ... = he/she is called ...

In your sentence, ea se numește Ana, the verb matches ea, so it takes the 3rd person singular form se numește.

A simple pronunciation guide is:

nu-ME-shte

A few important points:

• ș is pronounced like sh in shoe
• ește sounds roughly like ESH-te
• the stress is on me: nuMEște

So numește is approximately:

noo-MESH-te

Not perfect English spelling, but close enough for a learner.

The letter ș represents the sh sound, like in:

• ship
• shoe
• she

So in numește, the ending ște begins with that sh sound.

This is different from plain s, which is pronounced like English s in sun.

So:

• s = s
• ș = sh

Because Ana is a proper name, and in Romanian proper names usually appear without an article in this kind of sentence.

So after se numește, you simply put the name:

• Se numește Ana.
• Se numește Maria.
• Se numește Andrei.

There is no special case ending here that a beginner needs to add. The name stays in its normal form.

Yes, O cheamă Ana is also a common way to say that her name is Ana.

There is a small difference in structure:

• Ea se numește Ana. = She is called Ana
• O cheamă Ana. = literally something like They call her Ana

In everyday Romanian, both are used.

A useful comparison:

• Mă numesc Ana. / Mă cheamă Ana.
• Se numește Ana. / O cheamă Ana.

For a learner, se numește is very clear and easy to analyze grammatically, while o cheamă is also extremely natural in conversation.

Yes, but it means something different.

• Ea se numește Ana. = this tells you her name
• Ea este Ana. = this identifies the person: She is Ana

So if you are introducing someone's name, se numește is the better choice.

For example:

• You ask: Cum se numește? = What is her name?
• Answer: Se numește Ana.

But if you are pointing to a person in a photo:

• Ea este Ana. = She is Ana.

The normal order here is:

Ea se numește Ana.

Romanian word order is somewhat flexible, but this is the most straightforward and natural version for a learner.

You may also hear:

• Se numește Ana.
• Ana se numește. — possible only in special contexts, but not the normal choice

So as a beginner, it is safest to use:

Subject + se numește + name

or simply:

Se numește + name

It is basically neutral and correct in both spoken and written Romanian.

It works well in:

• introductions
• beginner textbooks
• simple descriptions
• everyday speech

In casual conversation, many speakers might more often say O cheamă Ana or Mă cheamă Ana for themselves, but se numește is still completely natural and standard.

The reflexive part changes with the person.

Here are the most useful forms of a se numi in the present tense:

• Eu mă numesc Ana. = I am called Ana.
• Tu te numești Ana. = You are called Ana.
• El se numește Andrei. = He is called Andrei.
• Ea se numește Ana. = She is called Ana.
• Noi ne numim ...
• Voi vă numiți ...
• Ei/Ele se numesc ...

So in your sentence, se numește is used because the subject is ea.

Romanian can use a fi in some identification sentences, but when talking about someone’s name, the usual pattern is with a se numi or a chema.

English says:

• She is Ana
• Her name is Ana

Romanian commonly says:

• Ea este Ana for identity
• Ea se numește Ana for naming
• O cheamă Ana as another common naming pattern

So the Romanian sentence follows Romanian grammar and idiom, not a word-for-word English pattern.