"Blend of John and Michael"
The name Johnmichael is commonly a male name from the "English" origin.
Johnmichael is a compound given name formed by joining John and Michael, two names long established in English use. John goes back to Hebrew Yohanan and Michael to Hebrew Mikha'el, but Johnmichael itself has no separate etymology beyond those two elements. It first appears in US birth records in 1969.
The pronunciation of Johnmichael is JON-my-kul.