What this site does:

You type in a surname or part of a surname. This site tries to guess the ancestry. It shows its guesses in the box at the top. Capitalization matters!

After that, this site searches Wikipedia for people with that surname and looks up their ancestry. It shows you the ancestries it found, and how many people had each of them. A person with two ancestries is counted as 0.5 for each. Three are each 1/3, etc.

To find surnames, this site just finds letters after the last space in a Wikipedia article title. So, surnames with spaces don't work, and neither do East Asian names (where the surname is before the personal name).

Predictions are generated with FastText.