Esha (एषा) is the Sanskrit word for "desire" or "purity" — an epithet of the goddess Durga. From the verbal root iṣ (to wish).
Esha Gupta (born 1985) is the Indian actress and model; Esha Deol (born 1981) is the daughter of Dharmendra and Hema Malini.
Esha 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 Esha reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.