Family name Mahadei (Mahadei 
) , all over the world, is a rare cognomen. The last name Mahadei is characteristic of Southern Asia, particularly India, where it is an extremely rare surname. Much more prevalently, Mahadei is the forename as well as the last name.
Bag, Patra, Patel, Putel, Gauda, Tandi, Nayak, Nahak, Mirdha, Bariha, Behera, Biswal, Padhan, Pujari, Dehuri, Dharua, Mahakur, Mohanty, Kahanra, Kumbhar, Pradhan, Maharana, Kisan, Bagha, Barik, Swain, Dei, Das, Dip, Nag, Sahu, Suna, Bewa, Bhue, Bhoi, Rana, Bagartti, Raut, Gaud, Jena, Naik, Malik, Majhi, Meher, Munda, Samal, Sethi, Sethy, Devi, and Mahananda