I know this is an old post, but there's a book called
New Hampshire Name Changes, 1768-1923, written by
Richard P. Roberts, it has all the names (14000)
of people who have had there name changed for various reasons.
They have:

Katie L. Merrill, name changed to Katie L. Piper,
in Plymouth,Grafton County,New Hampshire, page 140,
changed between June 1881 & June 1883.