It gets stranger. I was checking the etymology of Delores, and as I was suspecting, it is just a variant. However, some of the other variants were not suspected.
VARIANTS: Delora, Deloris, Dolores
DIMINUTIVES: Dollie, Dolly
OTHER LANGUAGES: Dolores, Lola, Lolita
Many nicknames in Spanish-derived cultures go back to Marian titles. “Lola” is a good example.