Reese comes from the Welsh Rhys, meaning "ardent," "enthusiastic," or "fiery." It was traditionally a male name and remains so in Wales (where Rhys is spelled correctly).
Today Reese sits in the U.S. top 175 for girls.
Reese 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 Reese reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.