No, His brother. Rezin P. Bowie, invented the Bowie knife.

James Black, a blacksmith, created bowie knife for James Bowie. Bowie's heroism caused the knife to become well known across the country, and that is why the name is the "Bowie knife," because it was the knife Jim used the most.

Bowie knife by James Bowie

The length of bowie knife would be around 12- 30 inches.

Bowie knife is a fixed blade knife created by Jim Bowie. These knives are easily available on both online as well as offline stores.