MACALPIN, a surname held by a branch of the Ross-shire or native Gael, and supposed to have been adopted from the Albanich, the first known inhabitants of Scotland. The general denomination Siol Alpin includes several clans, descendants of the race to which belonged Kenneth MacAlpin, under whom the Scots and Picts were united, namely, the clan Gregor, the clan Grant, the Mackinnons, the Macnabs, the MacDuffies, or Macfies, the MacQuarries, and the Macaulays. See these clans.