Nicknames for Sekai
4 nicknames, sorted by where they actually get used.
Office-safe
Sek
formal
Playground-friendly
Sey
casual
Seie
casual
Family nicknames
Sekkins
endearment
About Sekai nicknames: Most parents pick Sekai for the full formal sound. Then they reach for a shorter form at home. The office version and the playground version are usually different — that's the split above.