MosestheBlack said:
So does anybody know how to go about a legal name change? I've always wanted to legally insert my Baptismal name among my other names, but was never quite sure how to go about it.
Moses,
Check this site. They offer (for what looks to be a very reasonable price) packets of legal forms to accomplish this, but you can get those for nothing from the clerk of whichever court in your state has jurisdiction over name changes. And, name changes are a simple enough matter in almost all instances that one can represent oneself in applying to do so.
The site's value is in the links it provides to the law of each state on name changes; I reviewed the material at the links for Massachusetts and a couple of other states with which I am familiar and the info posted is accurate.
Name Change Law.
Keep something in mind though, the court process is one thing and generally not all that complex or time-consuming. The aggravation is in all the other aspects. As any woman who has changed her last name after marrying will testify, they aren't impossible to do - but they are an incredible nusciance.
I'm talking about making the change on your driver's license, credit cards, bank accounts, automobile titles and registrations, utility accounts, medical records, credit reports, insurance policies, library card, property deeds, school records, loans, social security account, etc..

None of those things happen automatically; and I've only listed the instances where it is relatively essential from a legal or practical point of view that you do so - not things like subscriptions, memberships, etc., which are more on the line of "nice", rather than "need" to do.
A simple solution is to either legally change your middle name or legally add your chrismation name as a middle name; you can then choose to call yourself by that name in introducing yourself to folks, etc., without invoking all the complications that go along with an outright legal change of your first name.
Either way, you need to be conscious afterwards of that line on credit and employment applications (as well as elsewhere) that asks "aliases

?" or "by what other names have you been known?".
Many years,
Neil