A relative's Jewish name has been pronounced (phonetically) by his family as "Ioiel" or "Yoyel." He was from Poland, and his family spoke Yiddish. I would like to know how this name should be written in Hebrew lettering. This is for a tombstone. Thank you for any help.
Stephen Katz

Hi, Most probably the correct way to spell the name in Hebrew would be יואל , which is equivalent to the name Joel in English. 

My condoleces 
Eran Gindes

Yoyel = יואל
 Miron Chumash

I have received several replies to my query, both privately and via the group, and they've been unanimous in their spelling of the name in Hebrew! I've responded to all replies that I've seen so far. My deepest thanks to everyone who replied; you've all provided me with the information I needed, for which I'm grateful.
Stephen Katz