The brand of clay is always specific to the country, city or local area you live in.
Specifying the brand of clay is rather meaningless to anyone else who cannot get hold of it.
Better to describe the type of clay.
I use a brown raku clay with lots of grog that can be fired anywhere from earthenware to stoneware.
The fact that it is raku helps to withstand temperature differentials between thick and thin parts without cracking - ideal for sculptures.