Joyeux Noël -
Joyful Christmas
It is the most common way to wish someone merry christmas
Tous mes meilleurs vœux de Noël -
All My Best Wished For Christmas
If you are in a professional environment, it is the best way to greet people with warm wishes of X-mas
Je vous souhaite un joyeux Noël -
I wish You A Merry Christmas
If you want to be formal, you can use this greeting to greet one or several people
Je te souhaite un joyeux Noël -
I Wish You A Merry Christmas
You can use this phrase when you are talking to one person and are being informal
Joyeuses fêtes -
Happy Holidays
You can use Joyeuses fêtes or Joyeuses fêtes de fin d’année when you want to wish happy holidays
Meilleurs voeux pour la nouvelle année -
Greetings For New Year
You can use this phrase if you want to wish new year's wishes but in a formal way
Meilleurs voeux pour les fêtes -
Greetings For The Holidays
If you wish to be informal in your new holidays greetings, use Meilleurs voeux or Meilleurs voeux pour les fêtes
Bonnes fêtes (de fin d’année) - Happy Holidays
It is another popular phrase used in French to greet people with happy holiday wishes