nickname

n. 绰号,昵称
v. 给...取绰号,叫错名字

Jess is just my nickname - my real name is Jessica.

杰西只是我的昵称，我的真名是杰西卡。

They nicknamed him "Lofty" because he was so tall.

他们给他起了个绰号叫“高个儿”， 因为他身材很高。