Athanasios \a-thana-sios, ath(a)-nasios\ as a boy's name is of Greek origin, and the meaning of Athanasios is "eternal life".

Athanasios has 7 variant forms: Atanasio, Atanasios, Atanasius, Athan, Athanasius, Thano and Thanasis.

Baby names that sound like Athanasios are Athenios and Athens.