That’s Marc With a C
It can be hard having an uncommon name in the world. There are certain situations that make it harder, like ordering food or giving your name with your coffee order. Because sometimes the waiter isn’t sure and you don’t want to embarrass them.
But this barista quite clearly felt like taking the joke out on Marc, with a C himself. To be honest, this one is actually very funny. Imagine you’re making coffee all day and you find an opportunity to make a good joke, you’re going to take it.