I guess you are talking about spain.
You probably will but there is no legal reason why either of you should change your name upon marriage. In fact in spain , for Spaniards at least, there is no legal ability to change ones name unless approved on the order of a judge
Of course take advice from a notary but as you will still be the same people I cannot foresee that you need to change the wills
In spain you cannot just make an amendment to a Will. Any alteration requires a new Will
Ps. I wrote this before Juan posted so I have not considered what he has said
See. https://www.netlawman.co.uk/ia/will-effect-marriage-divorce#Effect%20of%20marriage%20on%20your%20will
Another thought. As you will probably stipulate that the Will is made under english law you may need to consider what U.K. law demands as well as Spanish law So making a new Will after marriage might be the best thing to do
This message was last edited by johnzx on 12/03/2018.