Rombout is a Dutch masculine given name, equivalent to English Rumbold.
It is of Germanic origin, containing the Old Saxon elements -hrôm- ("fame", Dutch roem) and -bald- ("brave").
It is also possible that the first element comes from -Rûma- ("Rome"), a place name that also featured in old Germanic names.
[1] Early source usually Latinized Saint Rombout's name as Rumoldus, as in the first known mention in a pre-927 grant by Charles the Simple, mentioning that the Mechelen abbey had been built in his honor ("in honorem S. Rumoldi martyris constructam").
[2]