What is "atfalati"

The Atfalati , also known as the Tualatin or Wapato Lake Indians were a tribe of the Kalapuya Native Americans who originally inhabited some 24 villages on the Tualatin Plains in the northwest part of the U.S. state of Oregon; the Atfalati also lived in the hills around Forest Grove, along Wapato Lake and the north fork of the Yamhill River, and possibly at Portland.

The Atfalati spoke the Tualatin-Yamhill (Northern Kalapuya) language, which was one of the three Kalapuyan languages.