User blog comment:BluJayPJ/About Mr and Mrs Senicourt (headcanon)/@comment-28485972-20161120132054

I bet Ben borrowed the names from his actual maternal grandparents (he said on Twitter that his real-life mother's name is Nicole Bocquelet and that her maiden name is Senicourt). So whatever his grandparents' first names are, Nicole's parents' names are probably the same.