Marsylles or Marseilles: How To spell?

The word Marsylles is misspelled against Marseilles, a noun meaning "A general term for certain kinds of fabrics, which are formed of two series of threads interlacing each other, thus forming double cloth, quilted in the loom; -- so named because first made in Marseilles, France."

Word contains consecutive vowels 'EI' in between alphabets mars & lles is misspelled as 'Y'
Wrong Spelling:  mars-y-lles 
Correct Spelling:  mars-ei-lles 
Explore spell check of Marseilles to spell without errors.