Colette is a French diminutive of Nicole — itself from the Greek nikē (victory) and laos (people). The novelist Sidonie-Gabrielle Colette (1873-1954), known simply as Colette, is the most famous bearer.
Colette is rising in the U.S. — currently in the top 600.
Colette 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 Colette reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.