The Celts are an indigenous people of central Europe with large numbers in the United Kingdom, in France, and in Ireland where they are in the majority.
The first literary reference to the Celtic people as keltoi or hidden people, is by the Greek Hecataeus in 517 BC.
“Celt” is pronounced /kelt/, and “celtic” as /keltIk/ (in SAMPA). The pronunciation /seltIk/ should only be used for certain sports teams (eg. Boston Celtics NBA team).