Translation guide
The first letter of a word or name, or the initial character in writing systems like the alphabet or kana.
頭文字
first letter (of a word)
アルファベットの最初の文字
first letter (of the alphabet)
Referring to the initial letter or character of a written word.
The most common and direct translation for 'first letter' in the sense of the initial character of a word. Used for both alphabets and Japanese kana.
私の名前の頭文字は「K」です。
The first letter of my name is 'K'.
A more literal phrase meaning 'the first character'. It is clear and can be used in any context, but is slightly less idiomatic than 頭文字.
この単語の最初の文字は何ですか？
What is the first letter of this word?
Loanword from English 'initial'. Commonly used for initials of personal names, especially in fashion or branding contexts. Not typically used for general words.
バッグにイニシャルを入れてもらえますか？
Can I have my initials put on the bag?
Referring specifically to the first letter in the sequence of the alphabet.
The standard way to say 'the first letter of the alphabet'. Clear and unambiguous.
アルファベットの最初の文字はAです。
The first letter of the alphabet is A.
Also possible, but slightly less common than 最初の文字 when referring to the alphabet sequence.
アルファベットの頭文字は何ですか？
What is the first letter of the alphabet?
Referring to the first letter of a person's name, often used as a symbol or in monograms.
The most natural way to refer to someone's initials. Can be singular or plural.
彼のイニシャルはT.M.です。
His initials are T.M.
Can also be used for initials, but イニシャル is more common in casual conversation.
頭文字 (かしらもじ) specifically means the initial character of a word or name, while 最初の文字 (さいしょのもじ) is a more general phrase meaning 'the first character' in any sequence. For 'first letter of the alphabet', 最初の文字 is slightly more natural.
「Apple」の頭文字はAです。
The first letter of 'Apple' is A.
この文の最初の文字は大文字にしてください。
Please capitalize the first letter of this sentence.
イニシャル is a loanword from English and is used almost exclusively for personal initials. It sounds natural in contexts like monograms, autographs, or when asking for someone's initials. Avoid using it for the first letter of a common noun.
サインの代わりにイニシャルでいいですか？
Is it okay if I just use my initials instead of a signature?
お名前の頭文字は何ですか？
What is the first letter of your name?
アルファベットの最初の文字はAです。
The first letter of the alphabet is A.
名前の頭文字だけ教えてください。
Please tell me just the first letter of your name.