Alvai or Alvei: How To spell?

The word Alvai is misspelled against Alvei, which is plural of "Alveus"

Word ends with consecutive vowels 'EI' preceded by alphabets 'alv' is misspelled as 'AI'
Wrong Spelling:  alv-ai 
Correct Spelling:  alv-ei 
Find more wrongly spelled words of Alvei to spell it well.