Jordyn is the Y-spelling variant of Jordan — from the Hebrew Yarden (יַרְדֵּן), meaning "to flow down" or "descending," referring to the Jordan River that flows down from the Sea of Galilee to the Dead Sea.
Jordyn entered the U.S. top 1000 in 1993 and rose rapidly. Today it sits in the U.S. top 250. The gymnast Jordyn Wieber (born 1995) was the 2011 World All-Around Champion.
Jordyn 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 Jordyn reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.