How do you say hello my name is katelyn in french?

There are a couple of ways to say "Hello, my name is Katelyn" in French, depending on the formality of the situation:

Formal:

* Bonjour, je m'appelle Katelyn. (This is the most common and polite way to introduce yourself.)

Informal:

* Salut, je m'appelle Katelyn. (This is more casual and can be used with friends or people you know well.)

* Coucou, je m'appelle Katelyn. (This is very informal and is typically used with close friends or family.)

You can also say:

* Bonjour, je suis Katelyn. (This is also polite but less common than using "je m'appelle".)

Remember to pronounce "Katelyn" as "Ka-tlayn" in French.