If you say that something or someone is familiarly known as a particular thing or familiarly called a particular thing, you are giving the name that people use informally to refer to it.
例句
...Ann Hamilton's father, familiarly known as 'Dink'.安·漢密爾頓的父親，昵稱為“丁克”
英英詞典釋義
Adverb
1. in an intimately familiar manner;
"Sid, as he was familiarly known by his friends, was one of the most respected and devoted members of the socialist minority group"