Underhill Family

It remains unclear whether there were any actual Underhills living in the Shire. Frodo Baggins took his alias from the hamlet of the same name that lay under Hobbiton Hill, but it's certainly not impossible that there might have been a real family with that name living in the Shire. It's notable, however, that none of the Bree-landers seemed to have heard of Underhills from the Shire before, not even those who had travelled there several times. This seems to suggest that there were in fact no true Underhills beyond the borders of the Bree-land.

At least, the Underhills of Staddle would have taken their name from the Bree-hill. The place named Underhill in the Shire took its name from Hobbiton Hill and it might be presumed that any Shire-hobbits bearing the name would take it from the same source. On the other hand, the Underhills of Staddle apparently thought it possible that an Underhill from the Shire might be a distant cousin. For the two families to be related, the origin of the name must have been from the same hill, which would imply that part of the family had migrated from the Bree-land to the Shire, or vice versa.