Sometimes the changing spellings of surnames can tend to confuse us.
The first example is fairly obvious. The name Lidgey began life in the early 1600s in Redruth and on the Lizard (where it was more likely to be Ludgy). It doesn’t take a great deal of detective work to find the placename Lidgey at St Gluvias, spelt Lugie in 1613. Earlier, in 1342, this was spelt Lusy, the/s/ being pronounced /dg/ in Cornish by the later 1500s. (The placename is either from les, plant, or possibly lus, bilberries.) Sure enough, in the 1540s there was a John Lusye living at St Gluvias.
Lanxon is much more ambiguous. It’s been suggested that it comes from Lanson (the town). But it’s more likely to have originated in the English placename Langstone or Longstone. Admittedly, early spellings are ambiguous. Walter and William Lanston were found at Blisland and Camelford on the north west fringes of Bodmin Moor in 1543. While that might indicate they hailed from Lanson, there is also, significantly, a place called Langstone in the parish of Blisland. There were also folk called Langston or Langstone in various places in south-east Cornwall in the late 1500s and early 1600s, no doubt from another two places called Langstone to the east of Bodmin Moor.
During the later 1500s Langstone became the most common spelling and the variant Lanxon also emerged, both found in roughly the same two areas. However, while Langstone in the south east seems to have died out by the 1700s, Lanxon prospered in the district around Blisland. This strongly implies the modern Lanxons are likely to be able to trace their ancestry back to the place Langstone in Blisland.
Loam is the most puzzling of these three names. Its first appearance was not until the beginning of the 1700s in St Agnes. However, before that date several people named Lome are found in the records. This was clearly the original spelling, but its meaning is not obvious. The geography of the surname before the mid-1600s doesn’t give us many clues but also doesn’t preclude a Cornish language origin. But what?