Winter is the English word for the cold season — from the Old English wintru, with cognates across all Germanic languages.
Winter entered the U.S. top 1000 in 1978 and has been climbing. Today it sits in the U.S. top 350 and is rising.
Winter 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 Winter reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.