Saulė is the Lithuanian and Latvian sun goddess — one of the most important deities in Baltic mythology. The name simply means "sun."
Saule is widely used in Lithuania and Latvia.
Saule 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 Saule reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.