Without legal research, I'd say that what is important is that you can be identified clearly. In the case of a power of attorney, yes, I would say execute a new one that recites your name change. Banks and brokerages are nervous about POA, and it doesn't take much to spook them into not wanting to give effect to them. For your Will, it should not be a problem; whoever petitions for probate will explain the name change in their petition; you should leave a copy of the judgment that changed your name with your Will, for your personal representative's convenience. As far as other people's documents, again it's a matter of identifying you. Your mother's Will, which says "all to my children Bob, Ted, Carol and Alice equally," not a big problem if you can show that you are one of Mom's children and you legally changed your name from Bob to Starchild. But if there is any doubt about who you might be, then it would be better to give both your legal name and your former name.
Answered on Oct 27th, 2012 at 3:00 PM