The plural of motto can be either mottos or mottoes.
The motto of FIFA is 'For the Game. For the World.'.
Leaside's motto is 'Itineris Stabilitas Sanitas'.
Dollard-des-Ormeaux's motto is 'Viribus Unitas'.
The motto of Sheridan College is 'Shine Brighter'.
Conn's's motto is 'You Deserve It.'.
According to The Oxford Dictionary for Writers and Editors, plural of motto is mottoes.
mottoes
The word motto is a noun. The plural form is mottos.
(Plural, e.g., Men) Having been led by love of country.Having been led by love of (their) homeland. (A good motto for spies or soldiers perhaps.)
Lesotho's motto is ''.
Walsingham School's motto is 'No Motto'.
The motto of Dainese is 'Inspired by humans.'.
In the sentence "That motto is cool," the word "motto" is a noun. It is used as the subject of the sentence.
Belmont Academy's motto is 'as the co-motto'.
Iceland has no official motto.
The motto of Puntland is 'Star of the North'.
The motto of FIFA is 'For the Game. For the World.'.