Jimena is the Spanish feminine of Jimeno, possibly from Basque seme (son). Jimena Díaz (c. 1054-c. 1115) was the Asturian noblewoman, wife of El Cid (Rodrigo Díaz de Vivar) — she ruled Valencia for three years after his death.
Heroine of the medieval epic Cantar de mio Cid.
Jimena 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 Jimena reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.