Eithne is a female personal name of Irish origin. The meaning is "kernel" or "grain".
Other spellings and earlier forms include Ethnea, Ethlend, Ethnen, Ethlenn, Ethnenn, Eithene, Ethne, Aithne, Enya, Ena, Edna, Etney, Eithnenn, Eithlenn, Eithna, Ethni, Edlend, Edlenn.
Eithne is considered by some sources to be the feminine cognate of the name Aidan.
The name is popular in Ireland, and is borne by a variety of historical and legendary figures.