Final answer:
Donald Campbell became the fastest man on earth on Lake Eyre in the Bluebird by setting a land speed record of 403.10 mph in 1964.
Step-by-step explanation:
The individual who became known as the fastest man on earth on Lake Eyre when he set a land speed record in the Bluebird was Donald Campbell. On July 17, 1964, Donald Campbell set the world land speed record at 403.10 mph (648.73 km/h) on the dried lake bed of Lake Eyre, in South Australia. His father, Sir Malcolm Campbell, had previously held land speed records, but it was his son, Donald, who achieved this particular feat.
Donald Campbell's success in breaking the world land speed record was a momentous event, placing him in the pantheon of legendary speed record holders. His accomplishments are celebrated in both the history of motor racing and in British cultural heritage, where he followed in his father's footsteps to push the boundaries of speed and engineering.