engraving ??s

Hi.. i get a photobook with my photography package and was curious on how to do the engraving...? i know it should be name and wed date but should i do... Elisa and Scott last name/ or Mr and mrs last name? or mr and mrs Scott last name... or mr and mrs elisa and scott last name?/

ok i know its a dumb question but im just not sure and DH is not good with this crapola! TIA