Family name Ugnius (Ugnius 
) , across the world, is a very rare cognomen. The last name Ugnius is characteristic of Northern Europe, particularly Lithuania, where it is a rare surname. Much more prevalently, Ugnius is the forename as well as the last name.
Vas, Jurdonas, Norkunas, Valaitis, Urbietis, Katavicius, Petraitis, Ragauskas, Rudinskas, Rumsevicius, Didziokas, Jankauskas, Juozaitis, Timinskas, Vaitiekus, Sakavicius, Bakanauskas, Jakubelskas, Ivanauskas, Kalinauskas, Ramanauskas, Damijonaitis, Daunoras, Vasiliauskas, Pitrenas, Subacius, Tyla, Urba, Meska, Bucys, Bugys, Rimsa, Matkus, Mačys, Merkys, Mickus, Sutkus, Ceicys, Rimkus, Juodis, Vilkas, Veryga, Žukas, Adulcikas, Biguzas, Vaidila, Savickas, Bagvilas, and Steponavicius