Remi is from the Latin Remigius ("oarsman, rower") — most famously borne by Saint Remigius (c. Saint Remi of Reims (Remigius) — performed Clovis's baptism in 496, considered the event of medieval France; his cathedral at Reims is one of the oldest in France. Remi Garde — French football manager. The unisex use of Remi as a girl's first name in the US first entered top-1000 in 2014; remains slightly more common for girls than boys in the US.
Remi 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 Remi reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.