Coryphay or Coryphei: How To spell?

The word Coryphay is misspelled against Coryphei, which is plural of "Corypheus"

Word ends with consecutive vowels 'EI' preceded by alphabets 'coryph' is misspelled as 'AY'
Wrong Spelling:  coryph-ay 
Correct Spelling:  coryph-ei 
Find more incorrect spellings of Coryphei to spell right way.