Nicknames for Costello
12 nicknames, sorted by where they actually get used.
Office-safe
Cos
formal
Cost
formal
Llo
formal
Playground-friendly
Costy
casual
Costie
casual
Coste
casual
Costey
casual
Costeie
casual
Lloy
casual
Lloie
casual
Coy
casual
Coie
casual
Costello carries 12 common short forms — Cos, Cost, and Costy. The list splits into 3 office-safe picks and 9 playground-friendly options so you can match the moment.