Sollain or Sollein: How To spell?

The word Sollain is misspelled against Sollein, an adjective meaning "Sullen; sad."

Word contains consecutive vowels 'EI' in between alphabets soll & n is misspelled as 'AI'
Wrong Spelling:  soll-ai-n 
Correct Spelling:  soll-ei-n 
Find more incorrect spellings of Sollein to spell right way.