Origins

RETTIE: Of local origin from the old lands Reattie or Raittie in the parish of Innerboyndie, Banffshire.
‘The Surnames of Scotland – Their Origin, Meaning & History’ by G.F. Black, New York Public Library, 1946.

Rettie, or Raitie’s plough, in 1696 had a valued rent of £89, and belonged to Rev. Patrick Copland, minister of Cushnie. (Poll Book.)
John Alexander Henderson, Aberdeenshire Epitaphs and Inscriptions : with Historical, Biographical, Genealogical, and Antiquarian Notes (Aberdeen, 1907), https://archive.org/details/aberdeenshireepihend, p. 115.

Location

The excellent Maps of Scotland facility from the National Library of Scotland shows various place names throughout the years such as Little Rettie, Muckle (Big) Rettie, Moor of Rettie, Mill of Rettie, Rettie Cottage and Rettie Farm. The Blaeu Atlas of Scotland (Amsterdam, 1654) shows the place as Rete. Rettie Cottage, Banff, Aberdeenshire AB45 2AA is still viewable today via Google Maps.

Rettie

Farm steading. Alternative name: Reattie.
Site Details for Rettie, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).
Site Details for Rettie, Steading, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).

There is a famous bothy ballad called Hairst o’ Rettie (Harvest of Rettie) which alludes to the oncoming of automation and why so many farm servants emigrated to Canada and USA in the mid to late 19th Century:

Mill of Rettie

18th to 19th century. A one-storey and attic rubble building on an L plan, gutted and disused.
Site Details for Mill of Rettie, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).

Muir/Moor of Rettie

Site of Banff (known locally as Boyndie) Airfield which was built during 1942 and closed in the middle of 1946. Used by Banff Coastal Command Strike Wing during World War Two. Included separate male and Womens Auxiliary Air Force (WAAF) accommodation, and sewage disposal works.
Site Details for Boyndie Airfield, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).
Site Details for Boyndie Airfield site no. 3, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).
Site Details for Boyndie Airfield sites no. 4 & 5, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).
Site Details for Boyndie Airfield site no. 12, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).

Other Placenames

Rettie’s Court, Aberdeen, Scotland

Appears to have two entrances – one via 26 Broad Street and one via 51 North Street.

Miss Rettie, ‘straw-hat-maker, milliner, and dressmaker’ had a premises at 51 North Street.
M. Rettie & Son, ‘lamp manufacturers, tinsmiths, japanners, and oil merchants’ were at 26 Broad Street.
Scottish Post Office Directories, ‘Directory for the city of Aberdeen and its vicinity’, 1831-1832, p. 108.

Rettie Cottages, near Oyne, Aberdeenshire, Scotland

Situated 70 metres South-East of Buchanstone Station.
Site Details for Buchanstone Station, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).

Bridge of Rettie, near Oyne, Aberdeenshire, Scotland

Situated near Whitestone cottage/croft.
Site Details for Whitestone, Canmore, The Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS).

Rettie’s Bridge and Rettie’s Station, Ontario, Canada

Downstream from Kinmount in the valley of the Burnt River is the village of Burnt River. The first settler in the area was Alexander Rettie, who bought Lot 14 in the 5th Concession of Somerville Township in 1864. The lower Burnt River Valley contains some good farmland, and soon a thriving little farm community grew up called Rettie’s Bridge. A school section was set up in 1870 and a post office in 1873. Originally the village of Kinmount had been called Burnt River Crossing, but that title had been abandoned in favour of Kinmount as early as 1859, so the new hamlet changed its name from Rettie’s Bridge to Burnt River.

Burnt River got its big boost in 1876 when the rails of Victoria Railway reached the area. A station was established on the Rettie property & called Rettie’s Station. A fire destroyed the first structure and a replacement was built a mile north. The village grew up around the new station and the name Burnt River Station was adopted.
‘Friends & Neighbours: Burnt River‘, Kinmount Gazette, Vol. I, Issue 11.

Rettie Butte, Oregon, USA

A summit in Wheeler County. Originally called Squaw Butte. The Retties were early settlers in the area.
Rettie Butte in Wheeler County OR, HomeTownLocator.com.
Comment by user grschott on article Oregon geographic name changes come slowly, despite legislative push to drop ‘squaw’ by Associated Press, The Oregonian, 14 July 2014.

Rettie’s Bluff, Kangaroo Island, South Australia

On Kangaroo Island, lava possibly of somewhat greater age filled up a valley from Kingscote to Rettie’s Bluff, 5 miles west of Kingscote.
‘Official Year Book of the Commonwealth of Australia’, Issue 14, 1921, Section III – Physiography: Evidences of Past Volcanic Action in Australia, p. 52.