Wells is from the Middle English welle (well, spring) — a surname referring to a person who lived by springs/wells. H.G. Princess Wells — modern American naming.
Wells 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 Wells reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.