Gunay is from the Azerbaijani Günay (Gunay — gün sun + ay moon) — sun-moon, day-and-night radiance. Gunay is one of the Azerbaijani + Turkish feminine names — central to traditional Azerbaijani-Turkic dual-celestial naming heritage.
Gunay 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 Gunay reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.