Neckarios \n(e)-cka-rios\ as a boy's name is of Greek origin, and the meaning of Neckarios is "of nectar". In Greek mythology, nectar was the drink of the gods, and gave its drinkers immortality. The name of a Greek saint (20th century), canonized in 1961, who devoted his life to the restoration and organization of a convent on the Greek island of Aegina.

Neckarios has 5 variant forms: Nectaire, Nectarios, Nectarius, Nektario and Nektarius.