4. Warren Beatty and Shirley MacLaine
Warren Beatty and Shirley MacLaine, with their last names differing by just a letter, share more than just a familial bond. Shirley’s real last name is Beaty, making her the elder sister of the renowned actor Warren, who added an extra “t” to his surname. Both siblings are powerhouse talents in Hollywood, with multiple Academy Award nominations between them and notable wins: MacLaine for her role in “Terms of Endearment,” and Beatty for directing “Reds.”