et qa.tsin is attested as a proper place name on a boundary route in Joshua 19:13.

The attested form is a proper name in a boundary itinerary: Joshua 19:13 names it as the route passes eastward among other locations.

1. Proper place name on a boundary route · dominant

   In Joshua 19:13, the form is tagged as a proper noun and occurs in the clause describing a route that passed eastward; the APB renders the location as “Eth-kazin” among the places named on that course.

   Joshua 19:13

In the Anselm Project Bible: In Joshua 19:13, the APB presents the term as “Eth-kazin” in a list of locations on a boundary route.