How to Say "Middle Name" in Japanese

ミドルネーム

midoru nēmu

The English phrase "middle name" is translated into Japanese as ミドルネーム (midoru nēmu).

ミドルネーム is a noun used to refer to a name positioned between a person's given name and their surname.

Meaning: name between given name and surname (noun)

How do you pronounce it?

The romanization is midoru nēmu.

If you try to explain your middle name using native Japanese words, you might end up saying 下の名前 (shita no namae), which literally means 'lower name', often used to distinguish a given name from a surname.
The word ミドルネーム is written in katakana, the script used for foreign words, because the concept itself is viewed as a foreign import.
Because traditional Japanese names do not use middle names, many Japanese people may mistakenly assume you are talking about a 'second given name' or a 'nickname' when you say ミドルネーム.

僕のミドルネームはトムです。
My middle name is Tom.
This sentence is useful for stating what your ミドルネーム is.
Tatoeba #8972002 by Ninja, translation #2891720 by CK
ミドルネームは何ですか？
midurunēmu wa nan desu ka?
What is your middle name?
彼女はミドルネームを持っています。
kanojo wa midurunēmu o motte imasu.
She has a middle name.
2 more sentences on Tatoeba

Two friends are filling out official documents at a café.

陽葵 Himari

健太くん、ミドルネームはありますか？
Kenta-kun, midurunēmu wa arimasu ka?
Kenta, do you have a middle name?
健太 Kenta

はい、あります。
Hai, arimasu.
Yes, I do.
陽葵 Himari

書類にはミドルネームも書きますか？
Shorui ni wa midurunēmu mo kakimasu ka?
Do you write your middle name on the document too?
健太 Kenta

はい、書かないといけません。
Hai, kakanai to ikemasen.
Yes, I have to write it.

Sources

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