Khulan (Хулан) is the Mongolian word for the wild onager (Equus hemionus) of the Mongolian steppe — an endangered swift wild ass. Khulan Khatun (12th-13th c.) was the second principal wife of Genghis Khan — captured from the Merkit tribe, she rose to become one of his most trusted companions, accompanying him on campaign.
Featured in the Secret History of the Mongols.
Khulan 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 Khulan reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.