Auto Complete With Drop Down List

I have developed a spreadsheet that allows a user to "Autocomplete" a name by doubleclicking on a cell and typing in a few letters of the person's name.

I named the range that I want to appear in my list and I created the combobox in sheet 1, not in a userform. My problem is that when I doubleclick on a blue cell in Sheet 1 and type in a few letters of the person's name, the name doesn't fill into the cell. I have already specified a ListFillRange, so the Combobox knows what I am looking for. For some reason, the drop-down list is hard coded and won't populate the name that the combobox has already found. I don't receive any errors from the code that is already in place. If you could help me figure you how to get the names to populate in the blue cells, I would greatly appreciate it.

Attached is an example. If you try doubleclicking and typing in, say "Doe, John" in one of the blue cells in Sheet 1, you will see his name, but when you hit enter it won't populate. The cell stays blank!