Soheila is from the Persian سهیلا (Soheilā — like the star Canopus, soft) — feminine of Soheil from Arabic Suhayl (Canopus star). Soheila is one of the Persian feminine names — central to traditional Persian + Muslim heritage. Persian feminine name reflecting Persian astronomical heritage.
Soheila 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 Soheila reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.