Herucalmo means "Lord of Light" in Quenya (from heru, 'lord', cala, 'light', and the masculine agentive suffix -mo).
Quenya
herucalmo
masculine name. Herucalmo
Elements
Word Gloss heru “lord, master” cala “light, light; [ᴱQ.] daytime (sunlight), 12 hours” -mo “agental suffix”
Herucalmo
Herucalmo
The husband of the ruling queen Tar-Vanimeldë, the third ruling queen of Númenor; after her death, he briefly (and illegally) kept the throne from his son Tar-Alcarin (UT/222). His name seems to be a combination of heru “lord” and cala “light” with the agental suffix -mo.