Retains its original name after taming. Original Silithus creatures vanish after you complete the Antorus raid. To time-travel to the earlier phase, speak to Zidormi near Valor's Rest.
Level scaling: Most NPCs will scale with the Hunter's level, within the constraints of their level range. Hunters can tame regular NPCs up to 2 levels higher than them, but can only tame elite NPCs of the hunter's level or below.