Scaër is a commune in the Finistère department of Brittany in north-western France. Inhabitants of Scaër are called in French Scaërois. …Scaër is a commune in the Finistère department of Brittany in north-western France. Inhabitants of Scaër are called in French Scaërois. Scaër's population peaked at 7,838 in 1946 and has since declined to 5,245 in 2020. This represents a 33% decrease in total population since the peak census figure.