Practical aspects of changing your name in a common law jurisdiction
<p>Common law jurisdictions, in stark contrast to civil law jurisdictions, are considerably liberal in their procedures for allowing a name change. In some cases, for example in Ireland:</p>
<blockquote>
<p>no formality set out in law in Ireland for the change of a person’s name or the assumption of another name. You may change the name you commonly use by simply adopting a new name (<a href="https://www.citizensinformation.ie/en/birth_family_relationships/problems_in_marriages_and_other_relationships/changing_your_name_by_deed_poll.html" rel="noreferrer">source</a>)</p>
</blockquote>
<p>although deed poll exist. US states vary, but in some assuming a new name openly could suffice.</p>
<p>Assuming that no intention to deceive is at play, how would a person who changed his name from, say, John Suzie McMillan Manson, to John McMillan, would prove that he's the owner of his car, house, company bank account, and so on? How could government agencies and institutions connect that new name to his past name?</p>

<p>I am a notary public in Vermont and have had to deal with people who had name variations. Readers of Law StackExchange like to citations to reliable sources; I'm not going to do that, just describe my experience.</p>
<p>Many states do indeed allow a person to adopt a new name through usage. Government agencies and large commercial agencies don't like that, and they can and do thwart the law by imposing their own administrative procedures. If you don't like their procedures, fine, give a lawyer a $20,000 retainer, have the lawyer sue, and wait three years. And after spending all that money, the court might find that although it isn't a crime for a person to change their name by usage, there is no law requiring the administrative agency to accept it.</p>
<p>If you don't have tens of thousands of dollars to waste or years to wait, you have two choices. Get married, and use the marriage license as evidence of your name change. The format of marriage licenses is different in every state, so how well this works depends on the state.</p>
<p>The other option is to get a court-ordered name change.</p>

<h2>With evidence</h2>
<p>Typical evidence would be a series of witnesses who could state how long they have known the person and that the person’s name is John McMillan. Presumably John has documentary evidence that they are also John Suzie McMillan Manson.</p>
<p>Admittedly, this isn’t very practical. The more practical solution is to have two or more names and use the one that you can prove with documents for the important stuff.</p>

<p>Here in the UK, although you can call yourself by any name you like (so long as it isn't offensive or intended to deceive) you will not be able to get a passport in that name without an official Deed Poll document. Other institutions such as banks will also want to see this document before they will use your new name. It's fairly low cost to do it officially, about 70 GBP.</p>

name identification