what name; what's-his-name
Used to refer to a young male whose name the speaker cannot recall or does not know, often with a slightly dismissive or casual tone. The suffix 君 is typically used for boys or young men.
What's-his-name, that guy, is late again.
There's a tall kid in class, though I forget his name.
Standard kanji spelling using 何 for 'what' and 君 as a name suffix.
Mixed kana-kanji spelling; なに is written in hiragana while 君 remains kanji.
Compound of 何 (nani, 'what') and the name suffix 君 (kun), used as a placeholder for a young male's name.