Latin word horreo comes from Proto-Indo-European *ǵʰers-

Detailed word origin of horreo

Dictionary entry	Language	Definition
*ǵʰers-	Proto-Indo-European (ine-pro)
*horzēō	Proto-Italic (itc-pro)
horreo	Latin (lat)	I am frightful.. I dread, am afraid of.. I stand erect, stand on end.. I tremble, shiver.