familiarly  
adverb uk/fəˈmɪl.i.ə.li/ us/fəˈmɪl.i.jɚ.li/
  (INFORMALLY)      
 随便地;非正式地
in an informal way
  This group of bacteria, familiarly known as strep, causes a multitude of diseases. 这个菌群,也就是我们所熟悉的链球菌,会引起多种疾病。 
 He stretched out a hand and tweaked Augustus familiarly by the ear. 他伸出一只手,亲昵地拨弄着奥古斯都的耳朵。 
 - More examples
 - Ian is walking up to her, and she turns to greet him familiarly.
 - At the door his father turned to wink familiarly at Madeleine.
 - Don, as he is familiarly called by his fellow cyclists, is a member of the Sydney Bicycle Club.