Aithnea \a(i)-th-nea\ as a girl's name is a variant of Aithne (Gaelic) and Eithne (Irish, Gaelic), and the meaning of Aithnea is "fire; kernel".
The baby name Aithnea sounds like Ethnea, Ethnee, Athena, Athina, Athene, Atheena, Aidana and Whitnea. Other similar baby names are Aghna, Ailene, Aina, Aine, Aiyana, Anthonia, Arthene, Athie, Aivanna, Aivana and Airina.