4 occurrences in 4 dictionaries
Reference: Ithnan
Fausets
A town in the far S. of Judah, bordering on the desert (Jos 15:23-24; 1Sa 15:4).
Hastings
A city in the Negeb of Judah (Jos 15:23); site uncertain.
Morish
Ith'nan
City in the extreme south of Judah. Jos 15:23. Not identified.
Smith
Ith'nan
(given), one of the towns in the extreme south of Judah.
No trace of its existence has yet been discovered.