Ada is the Igbo word for "firstborn daughter" — given to the eldest girl in a family.
Distinct from the Hebrew Ada/Adah (Genesis 4:19). Also Ada Lovelace (1815-1852) was the pioneer computer scientist.
Ada 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.
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In Pythagorean numerology the letters of Ada reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.