Izod is a clothing brand that starts with "i".
One brand of sandals that starts with R is Ryka.
TO is what brand
Assuming by brand you mean make i.e. chevrolet, ford, pontiac. No there is no "brand" that starts with x. However if you meant brand as in model, yes there is. the Nissan Xterra.
Yumi brand dresses
UPS is a shipping brand. Uncle Ben's is a rice brand.
Academy
Mulbury
Aigner
Speedo is a brand of swimwear.
IBM, Intel and Izod are brand names. They begin with i.
KooKoo Cachoo a very rare brand