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 does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Eglah reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.