Italian word eccellente comes from Latin excellere, and later Latin excellens (Distinguished. Excellent.)

Detailed word origin of eccellente

Dictionary entry	Language	Definition
excellere	Latin (lat)
excellens	Latin (lat)	Distinguished. Excellent.
excellentem	Latin (lat)
eccellente	Italian (ita)	Excellent, superb, first-class. Very important, prominent, high-ranking.