Geltrude is the Italian form of Gertrude — Old German ger (spear) and trud (strength), "spear-strength." Saint Gertrude the Great (1256-1302) was the German Cistercian mystic.
Suor Gertrude appears in Manzoni's The Betrothed (1827).
Geltrude is a compound name. Its parts are þrúðr — each an attested element with a recorded meaning of its own.
Geltrude 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 Geltrude reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.