Nicknames for Onassis
10 nicknames, sorted by where they actually get used.
Office-safe
Ona
formal
Onas
formal
Sis
formal
Playground-friendly
Onasy
casual
Onasie
casual
Sisy
casual
Sisie
casual
Ony
casual
Onie
casual
Family nicknames
Onakins
endearment
Onassis carries 10 common short forms — Ona, Onas, and Onasy. The list splits into 3 office-safe picks and 6 playground-friendly options so you can match the moment.