Wallis is from the Old Norman French Waleis ("Welshman, foreigner from Wales") — historically a male surname (Wallis simulator, Wallis the architect) that became a famous female given name through one notable bearer. Wallis Simpson, Duchess of Windsor (1896-1986) — American socialite for whom King Edward VIII of the United Kingdom abdicated the throne on December 11, 1936 — one of the most-publicized abdications in modern monarchy history; her marriage to the former king (now Duke of Windsor) on June 3, 1937 was attended by only 16 people; Time magazine's Woman of the Year (1936) — the first woman to receive the title; her face appeared on the cover. The abdication crisis was dramatized in The Crown (Netflix 2016-2023) and The King's Speech (2010, Academy Award Best Picture). Wallis Currie-Wood — American actress. Henry V's brother John of Gaunt had the surname Wallace originally — same etymology.
Wallis 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 Wallis reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.