Original sentence: A given name (first name / forename / Christian name) is a personal name that specifies and differentiates between members of a group of individuals, especially in a family, all of whose members usually share the same family name (surname)
Edited sentence: A given name (first name / forename) is a personal name that specifies and differentiates between members of a group of individuals, especially in a family, all of whose members usually share the same family name (surname)