BOSTON—Enes Freedom will now be linked forever to a word he says he fought for his entire life. The Boston Celtics center changed his name from Enes Kanter to Enes Kanter Freedom in celebration of him officially becoming a United States citizen on Monday. He said Tuesday that taking the citizenship oath was “maybe the most unforgettable moment that I had in my life.” Freedom, 29, is a native of Turkey who has been an outspoken critic of President Recep Tayyip Erdoğan and the Turkish government. The 2011 first-round draft pick has also taken to social media to support Tibetan independence and criticize Chinese treatment of the Uyghur people. During games, he has worn shoes decorated to say “Free Tibet” and argued for a boycott of the 2022 Beijing Olympics. He first got a U.S. green card while he was with the Oklahoma City Thunder in 2015. He has been trying …