The Fennas word for fire is tain. Tain is a last name. In English tain is thin tin foil for mirrors. In French tain is silvering for mirrors or aluminium foil. Táin Bó Cúailnge is an ancient Irish mythological epic tale. Tain is the name of cities in France, UK (Scotland), Germany, Pakistan, South Korea and Afghanistan.
How did I come up with this word? The Welsh word for fire is tân, the Irish word for fire is tine, and the Breton and Cornish words for fire are tan.