The name Kateri is a girl's name of Native American origin meaning "pure". Kateri and is often added to lists like American Baby Names and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
St. Kateri Teckakwitha is the first Native American saint, canonized in 2012. St. Kateri was the daughter of a Mohawk warrior, born in 1656 in upstate New York. She converted to Christianity at age 20 and died at 24, and was known as "Lily of the Mohawk." Kateri was the name the saint took on, a native variation of Katherine, upon her baptism.