Rika is from the Japanese ri (理 — truth, reason) + ka (香 — fragrance) — "true fragrance"; also a German/Dutch short form of Frederika or Henrika meaning "peaceful ruler." Rika Ishikawa (born 1985) — Japanese singer; member of Morning Musume (Japan's iconic pop group); over 20 million records sold collectively. Rika Furude — central character in the iconic Japanese visual novel and anime Higurashi no Naku Koro ni (When They Cry, 2002-present); one of the most-celebrated tragic heroines in modern Japanese horror/mystery fiction; the franchise has sold over 1 million copies. Rika Watanabe — modern Japanese actress. Rika van Bockelhouse — Dutch historical figure. Princess Rika — modern Japanese figures. Frederika "Rika" Steinmeier-Bergsten — modern German-Norwegian noble.
Rika 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 Rika reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.