English surname Deas, or Dees, is explained as meaning "dice", and therefore a metonymic for a maker of, or player with, these objects. If Irish it's probably an altered form of Dease. This is one of only a handful of Irish surnames from Irish place names. It comes from the barony of Deece in the County of Meath. This family is actually a branch of the Norman-Irish family of Nugent, formerly de Nogent. There are, without doubt, dozens of places called Woodside in England and Scotland, and it's likely that more than one has given rise to a surname. Megan was a Welsh name, but it seems more American nowadays.