Eglah (עֶגְלָה) means "heifer" or "young cow" in Hebrew. In 2 Samuel 3:5, Eglah was the sixth wife of King David and mother of Ithream — listed at the end of David's six wives at Hebron.
Rabbinic tradition identifies her with Michal.
Eglah reduces to seven — the number of David's wife.