I realize I probably did not word my directions well. What I intended was that there would be one sound that would be present at either the beginning or end of all of the name sets. All of the children would have one name that starts with M, for example, or they would all have one name that ends with A.
You seem to be finding a different sound for each child and using it in both names. Since you already have two kids named I'm perfectly happy for you to continue this way if you do not find it too constraining. Or, if you like, we can adjust your names to a another pattern.