Ce Acatl was a Native American Human who was a direct ancestor of Kolopak and his son Chakotay.

While on a vision quest in 2372, Chakotay spoke to his deceased father Kolopak for advice about his supposed child with Seska, who had evidently impregnated herself with Chakotay's DNA. Kolopak spoke to Chakotay about one of his ancestors, Ce Acatl, who was the child of an Indian and one of the "white conquerors" who raped Native Americans on Earth centuries before. Ce Acatl became, in the words of Kolopak, a great leader of their tribe. (VOY: "Basics, Part I")

This ancestor was only mentioned in dialogue.
The name ce acatl means "one reed" in the Nahuatl language of Central Mexico. Acatl is also the name of a day sign in the Aztec calendar, so the name of Ce Acatl may have been his date of birth.
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