Joseph who co-invented rocky road ice cream

EDY

Think of the last name often paired with Dreyer on ice cream cartons.

This clue refers to Joseph Edy, one of the co-founders of the Dreyer’s ice cream company, which popularized rocky road flavor. The answer is his last name shortened to "EDY," a common way crosswords abbreviate names for brevity. If you’ve seen Dreyer’s branding, you might recognize "Edy" from the classic "Dreyer’s/Edy’s" logo split by region. The clue assumes familiarity with the ice cream’s history or the name behind it.