Keila is from the Yiddish קײלע — Yiddish rendition of Kelila (crown) or from the Hebrew biblical city Keilah (קְעִילָה, Joshua 15:44). Keila is one of the Yiddish feminine names — central to traditional Ashkenazi Jewish heritage. In the Hebrew Bible, Keilah was a fortified city in Judah saved by King David (1 Samuel 23:1-13) — one of the episodes of David's pre-kingship military campaigns.
Keila 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 Keila reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.