Whether to change one's last name after marriage used to be a question only women asked. Now, according to New York Times columnist Maureen Dowd, men are considering name changes as well--to completely new "blended" surnames adopted by both spousal partners.
In a recent column (access restricted to subscribers) Dowd tells of her Times colleague Jodi Wilgoren, who married Gary Ruderman in 2004. After considering several alternatives (Ruderwilg, Wilgorderman, Dergoren, Manwil), they opted for Rudoren, which sounds to me like a prescription muscle relaxant.
Los Angeles mayor Antonio Villaraigosa was a pioneer in this realm. The elected official formerly known as Tony Villar married Corina Raigosa 18 years ago; both took the newly coined tongue-twisting five-syllable last name. How fortunate for them that those final and initial "r's" rolled into each other and relieved some of the linguistic tension.
L.A.'s First Couple were practicing in the sort of elision that merging companies have engaged in for decades. Consider Kyocera, blended from Kyoto Ceramics; Garmin, from the first names of founders Gary Burrell and Dr. Min Kao; and--ancient history here--Nabisco, from National Biscuit Company. The results are not always so felicitous: see Mandriva (the sequel to Mandingo?), created from Mandrake Linux and Connective Linux; and Stellent, from stellar and excellent, but often mocked as "stupid and repellent" (and probably confused with Stellant).
It should be abundantly clear from these examples that name blending is best left to professionals. If you are betrothed and considering one of these tricky nomenclature endeavors, I'd be happy to be of service, probably for a lot less than your wedding planner is charging and with much longer-lasting results.
(Source for company name information: Wikipedia.)