Gus Grissom, Ed White, and Roger Chaffee
There was no Apollo 1 , only three astronauts got burnt to death, but I do not think it was a numbered as Apollo 1.
The question is not clear, there were three astronauts at a time in a Apollo mission , and there were 11 Apollo missions.
Apollo 1: Gus Grissom, Edward White and Roger Chaffee.
Apollo 3 was an unmanned test of the Saturn booster
All the three astronauts were killed in the tragic fire of Apollo1.
The names of the three astronauts of Apollo 13 , were James Lovell, Jack .L.Swigert, and Fred . W.Haise.
Three astronauts died in the Apollo 1 space accident: Virgil "Gus" Grissom, Edward H. White, and Roger B. Chaffee.
The Apollo missions had different crew sizes, with the majority of missions having a crew of three astronauts. However, the first two Apollo missions (Apollo 7 and Apollo 9) were crewed by three astronauts, while Apollo 8 and Apollo 10 had crews of four. Apollo 11, which famously landed on the moon, had a crew of three.
The three astronauts killed in the fire in Apollo 1 names were Gus Grissiom, Edward White. and Roger Chaffee.
Gus Grissom, Ed White, and Roger Chaffee
The number of astronauts varied in each Apollo mission. For Apollo 7, 8, 9, 10, and 11, there were three astronauts. For Apollo 12, 14, 15, 16, and 17, there were four astronauts. Apollo 13 had initially planned for three astronauts, but one was replaced due to illness.
3 astronauts on Apollo 13 one of them did not go up but he went up on Apollo 14.