No, Nikola Tesla and Elon Musk are not related. Nikola Tesla was a Serbian-American inventor, electrical engineer, mechanical engineer, and futurist who lived from 1856 to 1943. He is best known for his contributions to the design of the modern alternating current (AC) electricity supply system.
Elon Musk, on the other hand, is a business magnate, industrial designer, and engineer born in 1971. He is the founder, CEO, and lead designer of SpaceX; CEO and product architect of Tesla, Inc.; and co-founder of Neuralink and OpenAI. The name ‘Tesla’ in Elon Musk’s company, Tesla, Inc., is a tribute to Nikola Tesla and his groundbreaking work in electrical engineering, but there is no familial relationship between the two.