HELP! combining 2 names to make 1

My husband and I are having a girl, and my mom and his mom both have a lot of grandchildren and great grandchildren but not one named them. So my husband and I want to do something speacial for them and name our baby after them but combining their names to make one name (the first name) for our baby middle name will be (Faith) their name are

(My mom) Barbara Dian

(His mom) Maria Esther