Emer was the wife of the hero Cú Chulainn, praised in legend for her six gifts, including beauty and wisdom.
Emer 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 Emer reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.