Aldonas

Derived from the Lithuanian name Aldonis, which consists of two elements. The first element is either derived from the old Lithuanian verb aldėti meaning "to echo, to (re)sound" (see Aidas) or from the related old Lithuanian verb aldoti meaning "to shout, to scream" as well as "to make noise". The second element of the name consists of the masculine patronymic suffix -onis.

With that said, it should be noted that the name Aldonas is also frequently encountered as a masculine form of Aldona, which is a feminine name of uncertain meaning and origin that is used in both Lithuania and Poland. One of the available possibilities for the etymology of that name is a derivation from the same root as Aldonas, however.