Jarmila is from the Czech / Slovak Jarmila — Old Czech jarý spring/vigorous + milá dear/beloved — beloved of spring, spring grace. Jarmila is one of the Czech feminine names — central to traditional Czech-Slovak Catholic + Hussite heritage.
Jarmila is a compound name. Its parts are milŭ — each an attested element with a recorded meaning of its own.
Jarmila 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 Jarmila reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.