Mahasti (مهستی) combines the Persian mah (moon) and asti (being) — "moonlike being" or "great being." Mahsati Ganjavi (12th c.) was the medieval Persian poet of Ganja in Azerbaijan — author of romantic quatrains in the courtly tradition.
One of the great medieval Persian female poets.
Mahasti 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 Mahasti reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.