Other the Celts, name other ways people from Poland are identified.
Poland in Antiquity:  These people are identified as Celtic, Germanic, Baltic and Thracian tribes. Celts:  The exact geographic spread of the ancient Celts is also disputed; in particular, the ways in which the Iron Age inhabitants of Great Britain and Ireland should be regarded as Celts has become a subject of controversy.
Germanic, Baltic and Thracian tribes