Michaela is from the Czech / Slovak Michaela — Slavic feminine of Michael from Hebrew Mikhael (Who is like God?). Michaela is one of the Czech feminine names — central to traditional Czech-Slovak Catholic heritage. Czech feminine name reflecting Catholic heritage.
Michaela 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 Michaela reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.