Elvinas

Lithuanian form of the Germanic name Elwin, which is a short form of Edelwin, a variant form of Adalwin. In other words, you could also say that Elwin is a variant form of Alwin. Also compare Alvinas.

With that said, it should be noted that there are also sources that state that Elvinas is the Lithuanian form of the Anglo-Saxon name Ælfwine (probably via its younger form Elvin).