家では赤味がかった髪とそばかすのせいで、母が侮蔑を込めて「にんじん」と名付け、皆にもそう呼ばせています。

tbd

At home, because of his reddish hair and freckles, his mother scornfully named him "carrot" and had everybody else call him that.

彼女は赤味がかった髪の毛をしている。それで「にんじん」というあだながついている。

tbd

She has reddish hair, whence comes her nickname "Carrot".

She has reddish hair. That's why her nickname is Carrot.