Saygniorage or Seigniorage: How To spell?

The word Saygniorage is misspelled against Seigniorage, a noun meaning "A share of the receipts of a business taken in payment for the use of a right, as a copyright or a patent."

Word contains consecutive vowels 'EI' in between alphabets s & gniorage is misspelled as 'AY'
Wrong Spelling:  s-ay-gniorage 
Correct Spelling:  s-ei-gniorage 
Find more incorrect spellings of Seigniorage to spell right way.