Lucilla is a Roman name meaning little light, a tender diminutive of Lucia and lux, light.
Bright and delicate, it was borne by Roman noblewomen and empresses.
Lucilla 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.
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In Pythagorean numerology the letters of Lucilla reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.