🔼The name Zer in the Bible
It's probably not without significance that in Hebrew the name Zer is identical to one of two variants of the name of the Phoenician city Tyre (צר and צור). The Naphtalian town of Zer must have been located very close to Tyre and it's obvious that the two societies intermingled. Hiram the temple builder hailed from Tyre, and his mother was from Naphtali (1 Kings 7:13-14).
🔼Etymology of the name Zer
The name Zer obviously comes from the rich root-group צרר (srr):
It's not clear which of the few words spelled צר (sr) could be expected to reflect in this name, but it could be any (and all) of them. For a meaning of the name Zer, NOBSE Study Bible Name List goes with Rock, and similarly, Jones' Dictionary of Old Testament Proper Names proposes Flint. BDB Theological Dictionary does not offer an interpretation of our name and lists it alphabetically (and not under any of the verbs צרר, srr).