"Blend of John and Carlo"
The name Johncarlo is commonly a male name from the "English" origin.
Johncarlo is a compound given name built from John and Carlo, each of which is also used as a name on its own. John is the English form of the Hebrew Yohanan, and Carlo is the Italian form of Charles. The joined form follows the Italian habit of linking two given names into one, as in Giancarlo, but with the English John in place of Giovanni.
The pronunciation of Johncarlo is jon-KAR-loh.