Ethnan
Ethnan appears once in scripture, named in the Chronicler's genealogy of the tribe of Judah.
Among the Sons of Helah
The list runs through the descendants of Ashhur and his wife Helah and closes with three named sons: "And the sons of Helah were Zereth, Izhar, and Ethnan" (1Ch 4:7). Ethnan is placed third in the listing, his name preserved within the Judahite line without narrative or further notice.