Austeja is from the Lithuanian Austėja — austi (to weave). Austeja is the Lithuanian goddess of bees + family + marriage in pre-Christian Baltic mythology — central to traditional Lithuanian heritage.
Austeja 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 Austeja reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.