Final answer:
Arthur Ashe's middle name was Robert. He was a celebrated tennis player and an advocate for social justice and HIV/AIDS awareness.
Step-by-step explanation:
The middle name of Arthur Ashe, the legendary tennis player and civil rights advocate, is Robert. Ashe made history by becoming the first black player selected to the United States Davis Cup team and later winning three Grand Slam titles, including the 1968 U.S. Open, the 1970 Australian Open, and the 1975 Wimbledon. Despite facing racial prejudices and health challenges, his legacy extends beyond his remarkable tennis career as he was also known for his advocacy for social justice and his efforts to combat HIV/AIDS after his own diagnosis.