Spectator etymology in English

English word spectator comes from Proto-Indo-European *speḱ-, and later Proto-Indo-European *spéḱyeti (To be looking at, to keep looking at.)

Dictionary entry	Language	Definition
*speḱ-	Proto-Indo-European (ine)	to look
*spéḱyeti	Proto-Indo-European (ine)	To be looking at, to keep looking at.
*spekjō	Proto-Italic (itc-pro)	To observe, to see.
specio	Latin (lat)	I observe, watch, look at.
spectator	Latin (lat)	Spectator, watcher.
spectator	English (en)	One who watches an event; especially, one held outdoors.

Spectator etymology