Sindarin 

gildír

masculine name. Starwatcher

A name for the father of Celeborn appearing in notes from 1969, adapted from Telerin Gilitīro “Starwatcher” (PE23/143). It is clearly a combination of gil “star” and a form of tir- “watch”.

gildírion

masculine name. son of Gildír

An epithet for Celeborn as the son of Gildír, appear in notes from 1969 (PE23/143).