Most of the major titans have names in ancient Elvish, as the Elves have the oldest written records. Many of these titans have had numerous names over the millenia, but the accepted standard among the noble races is that they are generally called by their Elvish names.
Aglar Ada – Fatherhood, justice, wisdom (LG) – humans, dwarves
Naneth – Motherhood and mercy (NG) – humans and elves, expecting mothers of most sentient races
Orod-Tano – Metal and engineering (NL) – Dwarves, gnomes, some beast races
Taure Fea – Green things (forests, plains, etc), mystery, balance (TN) – elves, gnomes, many fae, some beast races
Duin-naithe – Water, weather, storms (CN), elves, gnomes, some humans, many beast races, some fae
Nuruhuine, Titan of Death – W.I.P.