It might not be consider Odd at all. Maybe Oddworld is the name of world, which doesn't have to mean anything.
The thesaurus: odd abnormal, atypical, bizarre, strange, unusual, weird. They stitch each others lips and that is odd. Paramite and Scarabs can't see and that strange. Glukkons have shorts legs and that abnormal, for answers we know why
And egg pooping queens which is bizarre