Mehregan is the ancient Persian autumn festival of love, friendship and the harvest, from mehr (love, the sun). It carries warmth and celebration.
Mehregan 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 Mehregan reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.