cologne

Cologne comes from French eau de Cologne, literally 'water of Cologne,' named for the German city where the original scented water was created in 1709. The city's French name, Cologne, traces back to Latin Colōnia Agrippīna. English simply clipped the phrase down to the last word.

What began as a specific brand name for one perfumed water from one city became so popular that it turned into a generic term for any lightly scented toilet water — a genericized trademark.

Cologne is a doublet of colony, since both ultimately trace back to the same Latin root, Colōnia.