[1] In the Down Survey Maps (1656-8), it is referred to as 'Carrow' [2] and 'Carrooe', and the accompanying terrier lists Thomas and Edmund Coppinger as proprietors by way of mortgage.

[3] The Ordnance Survey name book (c. 1840) describes Carhoo Lower as bounded on the north and east by Carhoo Upper and Leemount townlands, with a large portion being the Carhue demesne and the remainder mainly pasture.

O'Murchú (1991) holds Ceathrú as meaning a quarter, in this instance a measurement of land, such as a townland or ploughland, and being a smaller division than a tuath or triocha céad.

[4] The Placenames Database of Ireland gives the townland an Irish name of An Cheathrú Íochtarach, with Ceathrú meaning a quarterland.

[5] At the south-east end of the townland, is said to exist Poul Leather, a hollow within the River Lee, renowned for both its depth and treacherous current.