IDK your implementation, but might look somewhat like

c
bool:GetFamilyName(familyid, name[], len = sizeof name)
{
    switch (familyid)
    {
        case 1: strcopy(name, "foo", len);
        case 2: strcopy(name, "bar", len);
        
        default:
        {
            strcopy(name, "Undefined", len);
            return false;
        }
    }
    
    return true;
}