Calais is a unisex given name of French origin, derived from the city of Calais in northern France. It has been traditionally used as both a masculine and feminine name, though its usage has varied over time and between different regions. The name's popularity peaked in France during the late 19th to early 20th centuries but has since declined, making it relatively uncommon today. In other French-speaking countries like Belgium and Switzerland, Calais is also a recognized given name with some historical use. However, its usage has been more limited compared to France, particularly for females. Internationally, Calais is not widely used as a given name outside of French-speaking regions. It may be encountered occasionally in English-speaking countries due to immigration or personal preference but remains relatively rare.
"Calais has experienced a varied number of births annually since 1984, with the highest being 13 in 2010 and the lowest being 5 on several occasions."