Rumgarita" is a clever and brandable sub-brand name for a major rum company, as it combines "rum" and "margarita" to create a unique and memorable moniker.
By utilizing this sub-brand, the major rum company can appeal to a specific market segment, specifically, consumers who enjoy margaritas, by offering a new variation of the drink made with rum.
Furthermore, it also provides the major rum company with an opportunity to expand its product line and increase revenue streams.