Brown Driver Briggs

 Shobal = "flowing"
1. the 2nd son of Seir the Horite (Edom) and one of the dukes of the
Horites
2. son of Caleb, grandson of Hur, and founder of Kirjath-jearim
3. a Judaite, son of Hur and a descendant of Caleb
  1) possibly the same as 2