What does Rayan mean?
A common transliteration variant of Rayyan, from the root r-w-y (ر-و-ي), meaning 'well-watered, luxuriant, lush', and associated with Ar-Rayyan, a gate of Paradise. Spelled Rayan, Rayyan or Raiyan.
What does Hassan mean?
From Arabic حسن (ḥasan) 'handsome, beautiful, good', from the root ḥ-s-n which also gives husn ('beauty'). The sense spans moral goodness and physical beauty.