There are quite a few decks with the title of Celtic and this one is by Lo Scarabeo designed by Pietro Alligo and Giordano Berti seem to be more gypsy in style then Celtic in dress design. However, the cards themselves to use Celtic myths and the Irish names for the various characters. The Minor Arcana has the Formori for Wands, Fianna for Cups, Ulaid for Swords and the Tuatha de Danann. The cards are very bright though a little cartoon like.
Fomori, Tuatha de Danann, Ulaid, Fianna these are the names of the main descendants of heroes talked about in the legends of the Celts. These cards tell about the feats of that ancient people whose close relationship with the spiritual dimension of nature was only recently re-evaluated.