Thordis is from the Old Norse Þórdís — from Þórr (Thor) + dís (goddess, lady). 1230) and various Icelandic family sagas. Thordis Brandt (born 1942) — Icelandic-American actress. Princess Thordis — Icelandic heritage naming.
Thordis is a compound name. Its parts are Þórr + dís — each an attested element with a recorded meaning of its own.
Thordis 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 Thordis reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.