[name_f]Isobel[/name_f] 
Maybe Isobel-Grace, because I can hardly envision separating [name_f]Isobel[/name_f] from [name_f]Grace[/name_f] after all these years, but tbh, any [name_f]Isobel[/name_f] of mine would only be Isobel… so just [name_f]Isobel[/name_f] I think.