Imelda is the Spanish-Italian form of the Old Germanic Irmhild — ermen (universal) + hild (battle). Saint Imelda Lambertini (c.
Subject of Ramona Diaz's documentary Imelda (2003).
Imelda 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 Imelda reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.