I have seen a couple of suggestions on the web that maybe our surname came from a "vanished village". Apparently many villages in the borders did vanish. Curiously, I did stumble on "Toudupp" in the Liddisdale section of the Blaeu Atlas of Scotland 1654. Apparently it is based on the earliar 16th century maps of Timothy Pont. I believe it is a village symbol next to the name. This is consistent with the phonetic pronunciation of the surname(Tudup).See Hawick Word Book by Douglas Scott. This book as well as the Blaeu Atlas can be easily googled. I can find no modern reference to a village named "Toudupp".