People who say ‘My names are…’ think they know simple grammar than most of us because when two to three names are mentioned, they assume that’s a plural noun phrase.
For the ones who would listen, let’s tell them this: a full name is a singular nominal concept because it refers to one individual and represents a singular object.
Whether you have one or ten first names before your surname (i.e. family name, last name or second name), they refer to you. They all combine to form your identity.
- My name is Mirabel Spencer.
- My name is Brian Advik Kofi Mohammed Angelo Ademola.
However, the plural form might make sense if you answer different names in different places (e.g. as a secret agent), though this is an unlikely situation.
- My names are Michael, Zlatan, and Luiz.