Flip over your CM-10, to where the instructions are located. Now look toward the bottom of the page below the heading "Case types and Examples", under "Miscellaneous Civil Petition; Other Petition". You will find "Petition for Name Change" listed as an example. As you can see from Rule 3.400, your case is not a complex case under that rule. You are seeking nonmonetary, declaratory or injunctive relief. You are petitioning only for a name change, so that's one cause of action. The Form CM-015 would not normally be something to file, but if you want to try to get both petitions before the same judge you may want to ask the clerk if you should each file the form identifying the other spouse's case.

