I too have names on this list, but I found this list whie searching for the reason my DNA fingerprint test says I am significantly sephardic jewish, arabic, and kurdish, but my family tree is full of English, Irish, French, German, Dutch, and Danish surnames. After doing some historical research I found that many sephardic jews and muslims who had converted to christianity were kicked out of Spain; some of which emigrated to these countries, changing their names and adopting new cultures. Thus erasing their past to aviod persecution. It is possible to have a non-spanish or middle eastern surname and be middle eastern, spanish and/ or jewish by blood.

What is the source for these names? Are they sited in a book somewhere?

How did you determine these names?
Several of my family names are Griffin, Greber, Gibson

Dutch and Danish? Many Sephardic Jews emigrated to Holland and the Netherlands. My wife's family came from the Azores and some of the family emigrated to the Netherlands, others mostly to the US (New Bedford, MA and Gustine, CA). Her mtDNA results also show connections to the other countries you mentioned as well. Due to Diaspora, Inquisitions, Pogroms, and Holocausts, Jewish populations have become very widespread throughout the world.