Following up on a comment in this thread, I wanted to post some more evidence of accents showing up on gravestones.
In addition to the depated stones, I've seen a few stones that add an extra "r" sound onto the end of a word or name. The best example is the Annar Lawrence stone (1776) in Rumford, RI.
When I was looking over my pictures for name corrections, I found another possible example. There's a little blue slate stone in Pomfret, CT carved by the Soule workshop and dedicated to little Pearley Grosvenor, age 4 (d. 1791).* Pearley, we are told, was the son of Capt. Thomas Grosvenor and his wife, "Alletherr." It seems to me that Pearley's mother was probably named "Althea" and that one of the Soules just did his best to spell it the way it sounded.
I think this is likely because there ia at least one woman named "Althea Grosvenor" listed in 19th century census records for Pomfret (possibly a granddaughter).
*An aside — there is a tiny town in northeastern Connecticut called North Gosvenorsdale. People on the internet will tell you it's pronounced "GROVE-ner-dale," but I've never heard anyone call it anything but the much less dignified "North Grunnerdell." It's not as bad a name as Penn Yan, NY, but it looks terrible in print.
UPDATE: I found a marriage entry for Thomas and Allethea Grosvenor in the Pomfret section of the Barbour Collection's pre-1870 vital records on Ancestry.com. They were married on June 3, 1784.