Eulalia (Εὐλαλία) comes from the Greek eu (good, well) and laleō (to speak) — meaning "well-spoken" or "sweetly speaking." Saint Eulalia of Mérida (290-304 CE) was a teenage Spanish martyr; she is the patron saint of Barcelona.
Eulalia is widely used in Spain and Latin America. In the U.S. it remains rare but is rising as part of the broader return of saint names.
Eulalia 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 Eulalia reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.