Don't feel guilty! I think it's nice that you want to honor your family, but picking a name you love is important, too. Here are some M and J names that I like, not sure if you will like any of them, but here they are.
Mackenzie, Melanie, Madeline, Makenna, Marissa, Mia, Myla, Mila (meela), McKayla
Julianna/Julia/Julianne, Joelle, Jolene, Jade, Jada, Jocelyn, Justine/Justina, Jenna, Jamie, Jillian