Chiron
Centaurs were savage creatures, except for one, the wise Chiron who was also the teacher of Hercules. In the cartoon version "The Mighty Hercules", Hercules had a loyal centaur friend called Newton.
Pholus
Chiron
I think you might be thinking of a hippocamp. http://en.wikipedia.org/wiki/Hippocamp
I think it is called a tribe. Not sure.
A Centaur.
There is no fantasy creature that is half horse half human and NOT called a centaur.
It is called a centaur. If the upper half is human with the lower half horse and the horse section has all four horse legs, it is indeed a centaur. If it has the upper half of a human with the lower half of a horse but only 2 legs like a satyr it is a Sileni. There are also horse-headed men but I can not find the names for them. There is also the deity Hayagriva in Hinduism and Buddhism that has a white horse's head and a human body and is pictured as seated on a lotus.
One was Chiron. He was wise and clever. Achilles, Jason and Peleus were among his disciples.
it is a centaurs
Centaur is a mythical creature with head, arms and torso of a man and body and legs of a horse. In Latin it is called Tatem.
The species are incompatible and cannot interbreed.