Otilia is the Romanian and Spanish form of Ottilie — from the Germanic aud (fortune) and hild (battle).
Otilia is widely used in Romania. The novel Otilia's Enigma (1938) by George Călinescu is a Romanian classic.
Otilia 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 Otilia reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.