Oceanus ( ; Greek: Ὠκεανός "Ōkeanós", ] ), also known as Ogenus ("Ogenos", Ωγηνος) or Ogen (Ωγην), was a divine figure in classical antiquity, believed by the ancient Greeks and Romans to be the divine personification of the sea, an enormous river encircling the world.

Based on the paragraph above can we conclude that "Oceanus was worshipped by the Celts"?
It's impossible to say