Rhayn or Rhein: How To spell?

The word Rhayn is misspelled against Rhein, a noun meaning "Chrysophanic acid."

Word contains consecutive vowels 'EI' in between alphabets rh & n is misspelled as 'AY'
Wrong Spelling:  rh-ay-n 
Correct Spelling:  rh-ei-n 
Browse incorrect spellings of Rhein to spell it good.