That's like asking where the name milk comes from.
That's the same as asking why people call milk milk.
ーThat's like asking where the name milk comes from.
「それって牛乳の名前の由来を聞いているようなものだよ」
THat's like ...ing で「それは…するようなものだ」
where the name ... comes from で「…の名前がどこから来るか」
ーThat's the same as asking why people call milk milk.
「それは人々がなぜ牛乳を牛乳と呼ぶかを聞くのと同じだよ」
That's the same as asking ... で「それは…を聞くのと同じだよ」
why people call milk milk で「なぜ人が牛乳を牛乳と呼ぶか」
ご参考まで!