The Celtic Languages

Although Gaelic is the language of the prehistoric Celts, the ancient languages developed according to the times of the Roman Empire, such being Goidel and Breton. After the fall of Rome, Goidel developed into Irish, Scottish and Manx while Breton begat Welsh, Cymric and Erse.
 * Goidel >> Irish >> Ireland
 * Goidel >> Scottish >> Scotland
 * Goidel >> Manx >> Wicca
 * Breton >> Welsh >> Wales
 * Breton >> Cymric >> Gaul

The Manx word Wicca comes from the Gaelic Wyce, meaning "knowledge." In Welsh it is spelled Wica. Irish and Scottish have no "W" and use the letter "R" to where both use Recca and Reca, respectively. "Wise" in Gaelic is "Wycanach.". Wicca is a Celtic religion of the medieval era or otherwise there will be different words from different languages.
 * Breton >> Erse >> England