Full name of Pepsi

Answer 1

The name of the company is Pesico, Incorporated. Besides the Pepsi-Cola brands, the company owns the brands Quaker Oats, Gatorade, Frito-Lay, SoBe, Naked, Tropicana, Copella, Mountain Dew, Mirinda and 7up (outside the USA).

Answer 2

The plural for the proper noun Pepsi is Pepsis.

It does look awkward but even for an invented brand name, the rules for plurals apply. If you're not comfortable with that plural form, try Pepsi Colas.

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The plural form for the proper noun Pepsi is Pepsis. The noun Pepsi is a non-count noun; the plural form is a short form for the individual servings of the soft drink. The full form is a glass of Pepsi, a bottle of Pepsi, a case of Pepsi, etc.

Example: The waiter brought two Pepsis and a ginger-ale.

Answer 3

The plural form of the proper noun Pepsi is Pepsis.