BobY ... I am so impressed. Didn't think there was anybody but me who remembered those etiquette rules for names! Mercy!
Deed Poll you can do it in New Hampshire. I incorporated the name my Hawaiian friends gave me into my legal name by Deed Poll.
Includes visiting Clerk of Court at the County Courthouse, filling out the form -VERY carefully - and submitting it to Clerk. I was notified when to appear before the Judge and I spent about an hour in court awaiting my turn. (A judge schedules all the Deed Poll requests for one morning a month.) He asked me "why" and he accepted my reason and that was it. The Clerk mailed me an official notice of change. Cost $30.

anyone may change his/her name at any time without any formal legal process provided it is not done with the intent to defraud someone.

True. My Father was baptised Francis and used Frank from about age 12. It was his legal signature. Only one boyhood friend called him Francis which caused some confusion when he visited because we called Frank Jr. Francis! Brother Francis was legally Frank Jr. and all his contemporaries called him Frank.

Has anyone followed all that?
Ah, well!