Exporting a list to Excel in v11

Hi everyone,

I've built a list in List Manager, and now need to export that list in Excel.  I've attempted through the usual User Defined Format from a List report, as well as Executing an Output Set after creating an output set of the fields I need in Output Set Builder.  The issue I'm running into is that in the lname fields (where I need last name only) my household accounts now say, for instance, "Jack and Jill Smith Household" instead of simply "Smith."  Does anyone have any good tips to have the last name only appear in the last name field?  I hope that makes sense; thanks in advance!