Many of the modern day peoples of Western Britain and Scotland are among their descendants. These are taught of as being the 'native' British race. And included in their numbers as such as the Irish, the Scottish, the Welsh and the Cornish. They were pushed out of 'England' by such as the Romans and Britons as well as other such 'Illegal' Germanic immigrating tribes such as the Anglos (English) and Saxons. Although it is not so clear as to the Picts of the north, for some have them being moved out by 'Irish' immigrants from Ireland and thus becoming the 'Scotts'.
As stated, their Gaelic origins or origins from the tribe of Gaul, originate from as far east as Turkey and they are also so associate with such northern European groups across Europe and into France. This would likely mean that they are not to totally disassociated from the other Germanic tribes though their language seems to distinguish them from such. This is likely to the effects of the 'shifting of Israel among the nations of the earth.' Particularly first the 'northern nations' as that is were traditionally lost Israel is thought to have been dispersed.
My own sir name being traced to having originated out of Wales and of the Welsh people, this is of understandable interest to myself. Hendower means 'Old' - Hen and 'Tower' - Dower. This seems to follow since my Welsh family who assumed that name were of the Old Tower structure in Powis or Powys of Wales.
Some like to think of the Welsh as the oldest people, but they are not to be disassociated from the other Gaelic tribes or groups of the Irish, Scots and certainly not from the ancient Cornish peoples. As to such 'nations' which this evolution may be associated with as being shifted among, they may be otherwise be in association with the Phoenician, Semoni, Cimmerian, Cambrian, Trojan, Keltoi, Celts, Pryderi, Brython, Britons and even the British. This is not to exclude such as such Israelite and even Jewish connections which are further made to this people. In truth, through the evolution of time, it is difficult to disassociate them from any of the various peoples of Europe, including the Norse, Germanic, Ibaian and other such Europeans peoples, even those of Greece and Italy.
The evolution of the 'language' of this people seems to speak of its various origins in and of itself. Obviously a 'melting pot' of types, the basic language is identified as 'Laith' or Language and is called Cymraeg. It is listed and classed as P-Celtic which in turn to be listed as a branch of Indo-European language. However, it has, unlike any other Indo-European language, remarkable similarities with the Semitic language which is also known as Hebrew. This is not so shocking as this shifting of these people are traced back to this people's forced migrations back to Israel. In fact as late as the 6th century the British bard, Taliesin, referred to the language of Britain in his time as Hebrew and not Cymraeg, Welsh or British.
Of the 'Indo-European' languages there are 8 bases languages which I will list alphabetically though a regional listing may associate them more closely to likeness. They are Albanian, Armenian, Balto-Slavic, Celtic, Germanic, Hellenic, Indian and Italic. From Italic comes Latin and such Romance languages as French, Italian, Spanish and Romanian. From Hellenic comes Classical Greek, Kome or Intermediate Greek and Modern Greek. From Celtic some such as Gaelic, Irish, Welsh and Cornish. From Balto-Slavic comes Lithuanian, Bulgarian, Russian, Polish and Czech. From Indian comes Sanskrit and Hindi. And from Germanic comes Western Germanic, North Germanic, and East Germanic. From West Germanic comes 'low' Germanic such as Anglo and English; and 'high' Germanic such as Netherlandish German and Dutch German. From North Germanic comes Old Norse, Icelandic, Danish, Swedish and Norwegian. And from East Germanic comes Gothic.
The thrust of the flow of Hebrew similarities seems to identify the main flow from east to west of the Israelite tribes scattering, though likely also identifiable to others as well to various extents. Adding science and tradition, through historic manuscripts, ancient histories, literature, migration trails, mythology and even DNA, with some degree of certainty the Cymry came to Britain through such countires as Spain, Italy and Turkey after having left the land of Israel.
And thus the Cymry or Cymru are identifiable as of the lost tribes of Israel or in other words those nations with whom the scattered tribes of Israel did have their sifting amongst. And from there, such Biblical genealogies of the Talmud and Bible are a source of Israelite history (which is then ancient Welsh history) right to the dawn of man, Adam. Such legendary figure as King Arthur of 'South [Western] Wales/Cornwall' is considered a Christian Israelite of the tribe of Simeon by a tradition that the 'Cymry' well rise again. In that sense, certainly Israel will rise again.