Latin word celsus comes from Proto-Indo-European *kelH-

Detailed word origin of celsus

Dictionary entry	Language	Definition
*kelH-	Proto-Indo-European (ine-pro)
*cello	Latin (lat)
celsus	Latin (lat)	Erect. Haughty, arrogant, proud. Lofty, high, tall. Noble. Prominent, elevated.