Nicknames for Killian
3 nicknames, sorted by where they actually get used.
Office-safe
Kill
formal
Ian
formal
Playground-friendly
Killy
casual
Killian carries 3 documented short forms — Killy, Kill, and Ian — drawn from its Irish-rooted roots. The list splits into 2 office-safe picks and 1 playground-friendly option so you can match the moment.