Iresha is from the Sinhala — possibly from Sanskrit īśā (one who rules, goddess) with Sinhala feminine suffix. Iresha de Silva — modern Sri Lankan-American academic. Iresha Karunaratne — Sri Lankan researcher. Iresha Karunaratne — Sri Lankan figure. Iresha Perera — Sri Lankan economist. Princess Iresha — modern Sri Lankan royal heritage.
Iresha 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 Iresha reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.