This is a list of names in which the gender is masculine; and the usage is Japanese; and the first letter is I.
Ichirō 一郎, いちろう m JapaneseFrom Japanese
一 (ichi) meaning "one" and
郎 (rō) meaning "son". This was traditionally a name given to the first son. Other combinations of kanji characters are also possible.
Isamu 勇, いさむ m JapaneseFrom Japanese
勇 (isamu) meaning "brave" or other kanji having the same pronunciation.
Itsuki 樹, いつき m JapaneseFrom Japanese
樹 (itsuki) meaning "tree", using the kanji's nanori reading. Other kanji or kanji combinations can also form this name.