Harlowe is a variant spelling of Harlow, from an English place name meaning army hill.
Harlowe 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 Harlowe reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.