Nicknames for Kosei
4 nicknames, sorted by where they actually get used.
Office-safe
Kos
formal
Playground-friendly
Koy
casual
Koie
casual
Family nicknames
Koskins
endearment
Kosei carries 4 common short forms — Kos, Koy, and Koie. The list splits into 1 office-safe pick and 2 playground-friendly options so you can match the moment.