Italian word restare comes from Latin sto, Latin re-, and later Latin resto (I remain. I stand firm; I stay behind.)

Detailed word origin of restare

Dictionary entry	Language	Definition
sto	Latin (lat)	(Medieval Latin) I [currently] am (feel). (Medieval Latin) I am [located at]. I stand. I stay, remain.
re-	Latin (lat)	Again; prefix added to various words to indicate an action being done again, or like the other usages indicated above under English.. Back, backwards.
resto	Latin (lat)	I remain. I stand firm; I stay behind.
restare	Italian (ita)	(intransitive) to remain. (intransitive) to stay.

Words with the same origin as restare