John Gill Commentary Joshua 21:25

"And out of the half-tribe of Manasseh, Taanach with its suburbs, and Gath-rimmon with its suburbs; two cities." — Joshua 21:25 (ASV)

And out of the half tribe of Manasseh, Taanach with her suburbs. Of which see (Joshua 17:10).

and Gathrimmon with her suburbs, there was a city of this name in Dan, as in (Joshua 21:24); nor was it unusual for cities to be called by the same name in different tribes:

two cities; these are called Aner and Bilean in (1 Chronicles 6:70); in process of time cities changed their names; two cities were a proper proportion for this half tribe; two more were given out of the other half tribe on the other side Jordan, as appears by what follows.