Nehir is the Turkish word for "river" — borrowed from Arabic nahr. A modern Turkish feminine name evoking flowing water.
Used widely in modern Turkey.
Nehir 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.
In Pythagorean numerology the letters of Nehir reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.