Wenna is from the Welsh/Cornish gwen (white, blessed, fair). Wenna Sutton — modern Cornish-American figure. Wenna Davies — Welsh artist. Princess Wenna — Welsh-Cornish heritage naming.
Wenna 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 Wenna reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.