celt
Celt (noun) means a person belonging to one of the ancient Western European peoples the Romans called the Celtae.
Etymology
From Latin Celtae (singular Celta) from Ancient Greek Κελτοί (Keltoí). English Celts is from the 17th century. Until the mid 19th century, /sɛlt/ is the only recorded pronunciation. A consciously archaizing pronunciation /kɛlt/ was advocated during Irish and Welsh nationalism beginning in the 1850s.