Not knowing for certain its origin I am forced to guess, but I am reasonably certain that the "be" at the end are probably silent letters. This would make the pronunciation something like Black Coom. The "oo" is likely pronounced as in Zoom.
Boyce Combe's birth name is Boyce Molyneaux Combe.
Dominique Combe goes by Do.
Combe Force was created in 1940.
Combe Gibbet was created in 1676.
Delphine Combe was born in 1974.
The population of Combe Martin is 2,650.
Martigny-Combe's population is 1,714.
William Combe died in 1823.
William Combe was born in 1741.
Thomas Combe was born in 1796.
Thomas Combe died in 1872.
Taylor Combe died in 1826.