Sumedh's (the actor playing Krishna) real father's name is also Vasudev, just like Krishna's.
Sumedh is one of the names of The Lord Krishna... Sumedh absolutely acted like the Krishna...
Mallika is a name of Devi Lakshmi. It comes in Lakshmi sahasranama stotra and it means jasmine flower. Sumedh is a name of Lord Vishnu and it means wise.