hello,

is there any bus company from Morchit bus terminal to Hua Hin.

Can not find in google. thanks

Buses to Hua Hin normally leave from the Southern Bus Terminal (aka Sai Tai Mai).

Bell Travel run a VIP bus (only 3 seat across) from Suvarnabhumi airport to HH if that's any good. You could go by rail all the way to the airport, though of course it means you're travelling East to travel West again. About 300 bht. https://belltravelservice.com/public-bus/

There's also the train that I've never taken myself but suppposedly takes around 4 hours.

 

Minibuses from Ekkamai too if that floats your boat (again 4 hour journey).