Nicknames for Cillian
10 nicknames, sorted by where they actually get used.
Office-safe
Cil
formal
Cill
formal
Ian
formal
Playground-friendly
Cilly
casual
Cillie
casual
Iany
casual
Ianie
casual
Ciy
casual
Ciie
casual
Family nicknames
Cilkins
endearment
Cillian carries 10 common short forms — Cil, Cill, and Cilly. The list splits into 3 office-safe picks and 6 playground-friendly options so you can match the moment.