What was the name of Naomi's husband, who died in Moab?

Answer: Elimelech

Elimelech died in Moab, and later both of his sons, Mahlon and Chilion, died as well, leaving Naomi alone.

“The man’s name was Elimelech, his wife’s name was Naomi, and the names of his two sons were Mahlon and Chilion. They were Ephrathites from Bethlehem in Judah, and they entered the land of Moab and settled there. Then Naomi’s husband Elimelech died, and she was left with her two sons,”— Ruth 1:2-3 (BSB)