Is Arliss Howard related to Leslie Howard?

Yes, Arliss is Sam's father.

It Depends. If you are referring to the renowned actor/director who starred in "Happy Days," then, no. Assuming that you mean Ronald Howard, the actor who played Sherlock Holmes in the 1954...

Leslie Howard was born Leslie Howard Stainer, whose parents were Hungarian and not English. Trevor Howard was born Trevor Wallace Howard-Smith, whose father was English and mother was Canadian. There...

no

Ken Howard is not related to Ron Howard. Ron Howard's father is Rance Howard.