Could but I keep on coming back to the religious differences. The Celtic religion is so opposite from the Judaic philosophy. Of course, according to the Bible, Northern Tribes had become very pagan which was why the Assyrian were allowed to overrun them. Those who still followed JHVH would have fled south to Judah where worship continued if not with the same fervor as before. After the conquest it would have been possible for what remained to be totally stamped out.
The Assyrian and Celtic religions do share a few traits such as a triune or three faced god and goddess and some rather interesting fertility rituals but how much direct relationship there is between the two is not totally clear.
a.cricket
I'm going by the story of Jeremiah and the three daughters. Some Judaeans (including Jeremiah and the three daughters) escaped the Babylonian captivity and lived a short time in Mizpah beforing fleeing to Egypt against Jeremiah's warnings. God promised that all Judaeans that escaped to Egypt would die except for a remnant. That remnant would go to a land that Jeremiah "knew not", where Jeremiah would build and plant. The remnant left Egypt on ships probably with a few Egyptians as help, maybe that's where the "meka" and therefore "Mc" could have come from. There the three daughters, being princesses of the line of David, married into the already existing Israelite princes there that came on Dan's ships hundreds of years before. Jeremiah took with him the royal artifacts: David's throne, the stone of Scone, etc. God said the stone would be overturned three times and then would come Him that is the rightful king, He being the messiah. The stone turned over from Palestine to Ireland, from Ireland to Scotland, from Scotland to England. That's three.