And Jephthah came to Mizpah to his house, and behold, his daughter came out to meet him with tambourines and with dancing, and she was his only child, besides her he had neither son nor daughter. Bible

“came out to meet him.” The verb is feminine, whereas in Judges 11:31 Jephthah used masculine verbs.

“she was his only child.” So Jephthah had no designs on starting a dynasty. At least a daughter could have provided an heir, and that was not to be for Jephthah.

Commentary for: Judges 11:34