Ummmm, nobody throw sharp or pointy things at me for this, but Celtic does not refer to an nation or group of peoples. It refers to a language family. It is like trying to say I'm Romatic because my ancestors came from Germany, or Italy, or Spain, or France. All Romance Languages, all related, but what a difference.
We today say things like "I am Celtic" like we would say "I am Welsh" or "I am Scottish". When we should be saying "My ancestors spoke one of the Celtic Languages". A small point I know, and to some they may mean the same thing. But to an Anthropologist they are worlds apart. And a Geneticist doesn't know or care what language was spoken by the donor of DNA.

Now to throw a monkey wrench into the toe thing. The trait of having a "big" or first toe shorter than the next is not being linked to anything Celtic. It is being linked to the H Haploid genetic group. These are only one group of peoples who came north from the Middle East, split into two with one going into the Balkans and one across the northern Mediterranean Sea. The Peoples who settled in the British Isles after the last Ice age arrived from the Atlantic seaboard of France. Before that they were in the Basque region of Spain. and before that N. Italy.

May I offer these small tokens from the National Gallery Washington DC.











All of these were done in Northern Italy in the early 1500's.