Akane (茜) is from the Japanese name for the madder plant (Rubia tinctorum) — whose roots have been used since antiquity to produce a deep red-orange dye used for samurai banners and the traditional kimono. Akane Tendō is the lead female character in the Ranma ½ manga and anime (1987-1996). "Akane" also appears in Persona 5 Strikers (2020) and in numerous J-pop songs.
Akane 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 Akane reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.