I have had my moniker since shortly after making supervisor at my former employer.......retired by the way after 33 yrs.
Anyway, just after making supervisor, about 4 or 5 weeks I fired 3 of my welders. So being on the heavy side one of my men started calling me Shamu, after the killer whale. Or dolphin as Orange Marlin would say.
Anyway, it stuck and I still use it today in real life business. It's different, has a story behind it, and being in sales it helps people remember you.
I'm just glad it was not Jonah

BTW......my firings were even Union supported....discreetly. The workers were scamming scheduled overtime which cost there co-workers their share of the O/T.
Two were gone permanently because of prior histories, one got 30 days. On his return he apologized to each of his associates for what he had done.