You might like this one: Harpenden was thought to be "harpers' town", but it seems that was folk etymology ie. wrong. The "den" isn't "denn" pig pasture, but "den" valley, as in names with dene or dean. The first part seems to be herepaeth (that should be a diphthong ae, but I can't access the correct character) which means army way. This is topographical, as Watling Street, the boundary between the Danelagh and that part of England under Wessex rule, runs along a valley (slight, it says), and Roman roads would have been used for military purposes. (The Danelagh boundary also seems to be the boundary between the area with many old churchyard yews, and that where there are very few, in a few defined places. I don't know what this means. Did the Danes set about chopping down all those they found, or did the English confine them to a certain soil type, which did not favour yews? Or nothing.)