Iida is the Finnish form of Ida — from the Germanic id (work, industrious). A top-50 Finnish girls' name of the 2010s-2020s. Iida Räty — Finnish biathlete. Iida Aspö — Finnish historical figure. Iida Hirvonen — Finnish singer. Princess Iida — modern Finnish heritage naming. Iida Yrjönen — Finnish writer. Iida Niemiainen — Finnish Olympic athlete.
Iida 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 Iida reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.