🔼The name Jezer in the Bible
Jezer was one of the sixty-six proto-Israelites who made the transition from Canaan to Goshen in Egypt, and by the time of the second census of Israel, the progeny of Jezer had become its own sub-clan of the Jezerites in Naphtali (Numbers 26:49).
Note that the word Jezerite is spelled the same way as the name Izri (יצרי).
🔼Etymology of the name Jezer
The name Jezer is identical to the noun יצר (yeser), meaning form or shape, from the verb יצר (yasar), meaning to fashion, form or frame:
For a meaning of the name Jezer, NOBSE Study Bible Name List reads Form, Purpose and Jones' Dictionary of Old Testament Proper Names has Frame, Form.
BDB Theological Dictionary doesn't offer an interpretation of the name Jezer but does confirm that it is identical to the noun יצר (yeser), meaning form or shape.