Hidden Hero

Haldir was an Elf of Lothlórien, probably a Silvan Elf, and a marchwarden who guarded the forest's northern borders. Haldir was one of the Galadhrim and unlike his brothers, Rúmil and Orophin, Haldir had traveled outside Lórien and knew Westron. He and his companions are described as wearing grey hooded cloaks and living on flets in the trees.
Haldir was accompanied by his brothers when they encountered the Fellowship of the Ring who arrived in Lórien. His brothers interacted little with the Fellowship because they spoke little of the Common Speech.
He had heard of Aragorn, but there is no indication that they had met before. Haldir became their guide to the city of Caras Galadhon.
After Celeborn and Galadriel had nourished their guests, and they were set to depart, Haldir led them to their Elven boats.
Tolkien explained the name Haldir as Sindarin for "Hidden Hero"!!