Aryan and Iran come from the same root word meaning noble. Iran means the land of the Aryans, and I have never met a blond Iranian.
The Americans that I have met of Basque origin all have black hair and very light skin. But I have only met about half a dozen, so perhaps your experience is different from mine.
On the other hand, I have never read anything that connects the Basque to the Aryans who are Indo-European. The Basque speak a language unrelated to any of the other Indo-European languages like English, German, Russian, Spanish, Farsi (Persian spoken in Iran), or Hindi (one of the 300 languages spoken in India).
The Basque speak a language unrelated to any of the other Indo-European languages
Seems to me IIRC, that Basque is an ancient "base" or "root" language, possibly Indo-European, but one of the earliest languages known to man and still spoken.
As for the language, surely it is related to something. Even Gypsy (or Rom) is related to Sanscrit.