No . . . it was not a common practice. Native American men would have shunned the idea of adopting a European name, even if they had been adopted by white settlers. Further, I doubt there could be a blood-line Vermillion who was full-blooded Native American.There are Vermillions who are half and quarter Native American and they are associated with the Cherokee and the Sioux nations.One of my gg-grandfather's cousins left Indiana and went to North Dakota, where he married a woman who was half-Sioux.They had five children, including three sons, who were listed in the Indian census report of 1900 as residents of the Standing Rock reservation in North Dakota. But, until someone can prove that the Vermillions do NOT all descend from the same man, Giles Vermillion (b. 1685), then it would be unreasonable to assume there are any full-blooded Native Americans named Vermillion.