|Motto||All my hope is in God|
|File:Udny of Udny arms.svg|
|Clan Udny has no chief, and is an armigerous clan|
|Historic seat||Udny Castle or Knockhall Castle|
|Last Chief||The Udny of Udny|
Arms for Udny of the Ilk have been recorded on three occasions in the Lyon Register; 1672-7, 1748–51 and 1789.
The family Udny of Udny possessed the barony of Udny in Aberdeenshire for several generations prior to 1875. The name has been spelled sometimes as Widney and Uldney.
Scottish folk singer Jock Duncan said about the pronunciation of Udny, when commenting on his song about the Aberdeenshire town of Udny on his CD Ye Shine Whar Ye Stan!: "I’ve heard many versions o it - an tunes an aa, fen I wis young. Widney wis the pronunciation. Never naebody heard o Udny: ‘It’s Widney boy - are ye gaun doun tae Widney the nicht?’"
- Way, George and Squire, Romily. Collins Scottish Clan & Family Encyclopedia. (Foreword by The Rt Hon. The Earl of Elgin KT, Convenor, The Standing Council of Scottish Chiefs). Published in 1994. Page 467.
- Sir James Balfour Paul's Scottish Ordinary
- A New History of Aberdeenshire, Alexander Smith (Ed), 1875
- "Songs and ballads from a great Northeast singer: Jock Duncan". Springthyme.co.uk. Retrieved 2013-12-15.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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