I Have a "Name" Column Which I Want to Split Into "FirstName", "LastName": How Can I Do It?
http://word.mvps.org/FAQs/TblsFldsFms/SplitFirstNameLastName.htm

Rado, Dave
Word MVP Site, The
2005

Abstract:

Word's sorting capability is fairly rudimentary, especially for those migrating to it from WordPerfect (though it's surprising how many people don't realize Word can sort paragraphs, not just tables – or maybe not so surprising, given where the item is in the menus! The ability to sort on word 2 in field 3 would certainly be very useful (in Excel as well). But there are various things you can do in the meantime.