Natalia comes from the Latin natalis dies, meaning "birthday" or specifically "the day of the Lord's birth" — Christmas. Traditionally given to daughters born around Christmas.
Natalia is popular across Russia, Spain, Italy, Poland, and Latin America. In the U.S. it sits in the top 100 and is rising.
Natalia 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 Natalia reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.