Elmer, Don, Harry, and Jim
The members of Delta Tau Chi–perhaps better known as Hoover, Otter, D-Day, Boon, ???, Flounder, and Pinto. (Though I feel like John is missing from the list.)
- William, Patrick, Jon, Tom, Peter, Colin, Sylvester, Paul, (maybe John), Christopher, David, Matt, Peter
ETA: I’ve actually lost track of the number of the questions.
You got it- I just typed Daniel twice by mistake
(running with the numbering from Prof. Pepperwinkle)
- Tyrus, Walter, Christopher, George, and Johannes
- Phil, Stan, Ron, Nick, Barney, and Miguel
- Joe, Dick, Al, Dan, George, and Walter
- Ben, John, Henry, Frank, Margaret, and Walter
- Bruce, Bruce, Bruce, Bruce, and Michael
Hopefully these aren’t too tough.
Philosophy Department at the University of Woolamaloo
- Ben, John, Henry, Frank, Margaret, and Walter
Cast of MAS*H (TV) [the good episodes]
- Phil, Stan, Ron, Nick, Barney, and Miguel
Cast of “Barney Miller”
- Phil, Phil, David and Peter
One of the UNLV basketball teams from back in the day (1990 or so): Larry Johnson, Stacey Augmon, David ??, Anderson Hunt, Greg Anthony
- Tony, Doug, Heywood, Raymond, Ann
The first baseball Hall of Famers: Ty Cobb, Walter Johnson, Christie Mathewson, George Herman “Babe” Ruth" and Honus Wagner
-
Joseph, Johnny, and Frank
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Al, Otto, Charlie, Alf T., and John
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Jerome, Moses, Louis, Samuel, Joe and Joseph
Various incarnations of The Three Stooges
David Butler played Center the year they won. George Ackles was hurt that year and they didn’t repeat 
71. Ralph, Michael, Bobby, Ronnie, Ricky, Johnny
(Joe)Tinker to (Johnny)Evers to (Frank)Chance; DP combo back when the Cubs were great (just over 100 yrs ago.)
Easy one, because it is April the First: Steve, Ron and Steve
Apple co-founders, Steve Jobs, Steve Wozniak and Ron whatshislastname
- Jeff, Steve and Jack
and it’s a tough one, so some clues… They’re the 3 first names of a goofy trio in a sports movie.
Actors who played The Doctor (Hartnell, Troughton, Pertwee, Baker, Davison, Baker, McCoy, McGann, (Hurt), Eccleston, Tennant, Smith, Capaldi).
- Stephen, Bernard, Ian, Peter
Both correct. 
- Charles, Jiles, Richard, Roger
- Rogie, Marcel, Dave, Wayne, Luc.