Gloria is from the Latin gloria (glory, fame, renown). Gloria Anzaldúa (1942-2004) — Chicana feminist theorist; Borderlands/La Frontera (1987) is to queer Latina studies.
Gloria 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 Gloria reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.