In terms of ancestry, 23,875 people claimed American ancestry, which is equivalent to 5.8% of San Juans population. Other sizable ancestry groups included those of Italian American descent, French American descent, and West Indian descent. People of Italian descent numbered at 1,694, forming 0.4% of the population; people of French descent numbered at 1,064, forming 0.2% of the population. Finally, those of West Indian descent numbered at 1,393, forming 0.3% of San Juans population. Approximately 1,026 people claimed Sub-Saharan African ancestry; 719 claimed Irish American ancestry; 646 claimed German American ancestry; 431 claimed Arab American ancestry, and 346 claimed English American ancestry. There are many other ancestry groups in San Juan, but they are very scant.. How many percent of people were not of American ancestry?