"Blend of John and Thomas"
The name Johnthomas is commonly a male name from the "English" origin.
Johnthomas is a compound given name formed by joining the two established male names John and Thomas and writing them as a single word. Both elements are long-established English given names, John going back to Hebrew Yochanan and Thomas to Aramaic te'oma, meaning twin. The joined form appears in United States birth records from 1972.
The pronunciation of Johnthomas is JON-tuh-mus.