7UP (PepsiCo) is a lemon-lime flavoured soft drink.
There is no single explanation behind the name of 7UP…
“Although C.L. Grigg never explained the origin of the soft drink’s name, many stories abound. The most popular story is that Grigg named the soft drink after he saw a cattle brand with the number “7” and the letter “u.”
Other stories suggest that the name reflects the drink’s seven flavors and carbonation, or that Grigg came up with the name while playing dice.