Timur is one of Linh's dwarven bodyguards. Timur was first mentioned in Book 8.5: Unlocked in Linh's Registry File in the section named "Bodyguards".
It said that Linh has two bodyguards, one of which is Timur and the other of which is Urre. Timur remains primarily underground and has not shared anything about himself with Linh.
The name Timur means "Iron" in Turkish.