[Cronos]

There were even Iberian Celts (until the arabs came to Spain)

What are you talking about??? Pre-Roman times, northern Spain near the Pyrenees was Celto-Iberian, true, but there were Basques while southern Spain was Iberian, different from the Celts. Then, the Romans invaded. After the Romans, came the Vandals (Germanics). The 'Arabs' never invaded Spain, it was the Berbers from Nord Afrique. These Berbers never changed the racial structure in the way you suggest.

[MacDorcha]

I seem to be crossing modern terms with the historical ones.

Should drop "arab" and place "semites" instead.

Before the Romans invaded (indeed, at a time when the Celts had made it to Rome) it was Celtic in tounge, culture, and genes. They had silver mines in the region when the Romans first encountered the Celts. The first Celts they met where the indeed Iberian.