How do I say "Who gave you your name?" in Japanese?

Question

Answer

Hi, I hope this can help you.

casual：
だれがあなた（に/の）名前を付けたの？
Dare ga anata ni/no namae wo tsuketa no?
polite：
だれがあなた（に/の）名前を付けたのですか？
Dare ga anata ni/no namae wo tsuketa no desuka?

に/の,Both OK.

The verb 'つける（付ける）' has many usages like 'put' or 'Put on'.
付ける：Tsukeru(v) 
付けた：Tsuketa(v.p)

パンにバターを付ける (spread) butter on bread.
むねになまえを付ける (put) name on his chest.
本にタイトルを付ける　(give) a title to a book.

He 'named' his son Ken.
彼はむすこにケンと'名付けた'。(concise)

彼はむすこにケンという名前を付けた。
He gave his son a name "Ken".
(direct translation. in English it's roundabout but in Japanese natural.)

Good luck!

Answer

"Who gave you your name?" 「名付け親は誰ですか？」
This is a more natural expression in Japanese.

Hope this helps