Wearing a traditional Native American shirt, Boston Celtics star Kyrie Irving was welcomed into the Standing Rock Sioux tribe on Thursday and given the Lakota name Little Mountain.Joined by his sister, Asia, Irving stood on a buffalo skin as a tribe elder, Vernon Iron Horse, prayed. He followed a variety of traditions before a beaded medallion was placed over his head as he learned his Lakota name. His sister was given the name Buffalo Woman.”We’re welcoming home two of our own,” Standing Rock chairman Mike Faith said. “This definitely is history.”The ceremony took place in Cannon Ball, N.D.Elizabeth Larson, Irving’s mother, was part of the Standing Rock Sioux at birth but was adopted as a small child. She died when Irving was 4, but on his own, he has learned more about his Native American heritage.When Irving discussed his lineage in an ESPN interview in 2016, members of the Standing Rock Sioux pieced together his background. They learned his grandparents and great-grandparents were from the White Mountain family of the Standing Rock reservation in South Dakota.