It depends on the context...
In France, it is often "la boxe thaï" (or 'la boxe thaïlandaise'). To be more correct, you could use "Muay Thaï" They both mean the same thing. Muay Thai makes use of punches, kicks, elbows and knee strikes. It is basically Thai boxing/Thai kick-boxing.
But there is also "la boxe birmane" (aka. Lethwei) which is Burmese kick-boxing.
As in English
Kick boxer in Thai is muay Thai which is Thai kickboxing
"How do you spell it in French?" is "Comment ça s'écrit en français?"
Kickboxing weight classes are weight categories specific to the kickboxing discipline
this is how you spell spelling in french: l'orthographe
Spell Ryan in french
"Ajouter" is how you spell "add" in French.
the only one i know of is called savate which i think is a style of french kickboxing
you spell snails in french escargos
How to spell the name Joseph in French
You spell "Acquisition" like this in French: Saisie.
You spell it in French...... Matieres. And do not forget the accents.