Nicknames for Sebastian
6 nicknames, sorted by where they actually get used.
Office-safe
Seb
formal
Bastian
formal
Playground-friendly
Bash
casual
Sebby
casual
Family nicknames
Bas
endearment
Baz
endearment
Sebastian carries 6 documented short forms — Seb, Bash, and Bastian — drawn from its English-origin roots. The list splits into 2 office-safe picks and 2 playground-friendly options so you can match the moment.