The Spanish verb 'manchar' (to stain) comes from the Latin verb 'maculare' meaning 'to stain or spot', which itself was derived from the Latin noun 'macula' meaning 'spot' or 'stain'. The evolution from Latin 'maculare' to Spanish 'manchar' involved a common sound change where the Latin '-cul-' became '-nch-' in Spanish, a pattern seen in other Spanish words as well.

A common related Spanish word is 'mancha', which is the noun form meaning 'stain' or 'spot'. You might also encounter 'manchado' (stained) as the past participle form. These words form a family all relating to the concept of marks or stains.

The English word 'maculate' (meaning 'spotted' or 'stained') comes from the same Latin root 'maculare'. While 'maculate' is somewhat rare in modern English, its opposite 'immaculate' (meaning 'perfectly clean, spotless') is very common. The connection is clear: 'immaculate' literally means 'without stains'. Another related English word is 'macula', used in medical contexts to refer to spots on the skin or, most notably, the macula of the eye (a spot on the retina).