'Queyrat' originates from French, likely as a locational surname derived from the toponym 'Queyras' (a valley and region in the French Alps).

'Queyrat' appears to have developed as a surname indicating origin or association with the area 'Queyras' (Occitan/French regional name) and became fixed as the family name 'Queyrat' in modern French usage.

Initially it indicated origin ('from Queyras'), but over time it evolved into a hereditary family name without necessarily indicating current residence in that place.