There was a group a Lamonts who escorted a lady Lamont to Braemaer for her wedding. Most of who in later years changed their name back only spelled it with a “d” to distinguish themselves, thus Lamond
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George Young CLSNA Senior VP Seanair agus Seannachie
I have seen the final "d" or "t" used interchangeably depending upon the region and the times, with virtually no variation in pronunciation. (LAH-munt).
Surnames, as genealogists know, are not an exact science and, at least in American English, there was really little standardized spelling until the 1800s. Your last name is basically pronounced the way your family says it. And so, in my family, it was anglicised to La-MOND (sounding rather French to the ear, like bicyclist Gregg LeMond, who by the way once claimed his family had Ulster Scots roots) but almost certainly just a couple generations earlier their ancestors said: LAH-munt (or even closer to LAW-munt, reflecting the Norse origin of the name).
Lamond was my father's and grandfather's middle name. They pronounced it the same way. I don't know where the name first entered my family. Our surname is Brown.