Stevie is the diminutive of Stephen or Stephanie — from the Greek stéphanos, meaning "crown" or "garland." Used as a girl's name in its own right since the 20th century.
Stevie Nicks (born 1948), the Fleetwood Mac singer and solo artist, is the most famous bearer. Today Stevie is rising fast as a girl's name — currently in the U.S. top 600 and climbing.
Stevie 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 Stevie reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.