What soft drink once touted itself as having lymon

The soft drink you're thinking of is 7 Up. It was originally marketed as having "lymon" instead of "lemon" in its name.

The reason for this was a legal battle with the company that owned the rights to the word "lemon". To avoid trademark infringement, 7 Up used the spelling "lymon" for many years.

Eventually, 7 Up switched back to the traditional spelling "lemon," but the "lymon" era remains a fun bit of soft drink trivia!