In J. R. R. Tolkien's Middle-earth legendarium, Galdor is a common Sindarin name:

galdr, in Old English meaning "song, incantation, spell"

Galdor of the Havens, an Elf of the Grey Havens from The Lord of the Rings

Galdor of Gondolin, an Elven lord of Gondolin from The Book of Lost Tales