Tomoe (巴) is the Japanese word for the comma-shaped magatama swirl. Tomoe Gozen (c. The most famous female samurai in Japanese history.
Tomoe 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 Tomoe reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.