Magdalena is the Spanish, German, Polish, and Latin form of Mary Magdalene — meaning "of Magdala" (a town on the Sea of Galilee whose name means "tower").
Magdalena is widely used across Spain, Latin America, Poland, Germany, and Scandinavia. Today it sits outside the U.S. top 1000 but is quietly used.
Magdalena 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 Magdalena reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.