The story
- Welsh · derived fromgarth“cliff; enclosure”
- English todayLydiard
Habitational surname from the villages of Lydiard Millicent and Lydiard Tregoze, both in the borough of Swindon. The placename was recorded as Lidgerd or Lidegærd in the Cartularium Saxonicum; the second part of this word coul derive from Welsh garth (“cliff; enclosure”).
Etymology from Wiktionary, CC BY-SA 4.0.