Sinkler History, Family Crest & Coats of Arms
The Sinkler surname was a Norman habitation name, derived from when families lived at St. Clai-sur-Elle in La Manche and in St-Clair-L'Evêque in Calvados, Normandy where the site of the seignorial castle is still discernible. 
Early Origins of the Sinkler family
The surname Sinkler was first found in the barony of Roslyn, Midlothian where King Alexander I of Scotland granted a parcel of land to William de Sancto Claro in 1162. They were originally from St Clare, Pont d'Eveque, Normandy, and are descended from Walderness Compte de Saint Clare who arrived in England with William the Conqueror.
"Wace mentions the Sire de St. Clair at Hastings. This was Richard de St. Clair who held lands, Suffolk, 1086, "  The Domesday Book also notes that Britel de St. Clair, brother of the aforementioned Richard de St. Clair held lands in Somerset. Britel's son William de St. Clair held lands in Dorset in 1130.
Despite these early records in England, the name is more often than not associated with Scotland. For it is there that the name excelled both in numbers and power. "The first Sinclairs in Scotland appear to have been vassals of the great territorial magnates, de Morville. Their first possession in Scotland was the barony of Roslin, near Edinburgh, which they held in the reign of David I (1124-1153). The earliest bearers of the name appear in charters connected with the abbeys of Dryburgh and Newbattle, the Hospital of Soltre (now Soutra in Midlothian), the church of Glasgow, etc." 
Sir Henry Sinclair fought with King Robert the Bruce at Bannockburn, and helped assure the independence of the Scottish Kingdom. Sir Henry's son married Isabel, the heiress of the earldom of Orkney, and their son became the senior Earl of Norway. The Clan achieved great status having married into both Norwegian and Scottish royalty.
Back in England, the name prospered as well as The Hundredorum Rolls of 1273 confirms: John de Sanet Claro in Suffolk; Robert de Sancto Claro in Somerset; and William de Sancto Claro in Kent. 
Over in Somerset, from the first listing above, Richard Seinteclere and William Seyncler were both listed in Kirby's Quest. 
Early History of the Sinkler family
This web page shows only a small excerpt of our Sinkler research. Another 189 words (14 lines of text) covering the years 1470, 1455, 1607, 1345, 1400, 1696, 1582, 1566, 1643, 1566, 1576, 1566, 1610, 1676, 1683, 1750 and are included under the topic Early Sinkler History in all our PDF Extended History products and printed products wherever possible.
Sinkler Spelling Variations
Spelling variations of this family name include: Sinclair, Saint Clare, Sancto Claro, Singular, Sinclaire, Seincler, Sanclar, Sincklair, Sinclear, Sincler and many more.
Early Notables of the Sinkler family (pre 1700)
Notable among the family at this time was Henry I Sinclair, Earl of Orkney, Baron of Roslin (c. 1345-1400), Scottish and a Norwegian nobleman; Prince of Orkney, 3rd Earl of Orkney; and George Sinclair or Sinclar (d. 1696), a Scottish mathematician, engineer and demonologist, the first Professor of Mathematics, Glasgow, probably a native of East Lothian.
Other notables include: George Sinclair fourth Earl of Caithness (d. 1582), second, but eldest surviving, son of John, third Earl of Caithness; and George Sinclair, fifth Earl...
Another 82 words (6 lines of text) are included under the topic Early Sinkler Notables in all our PDF Extended History products and printed products wherever possible.
In the United States, the name Sinkler is the 17,136th most popular surname with an estimated 2,487 people with that name. 
Migration of the Sinkler family to Ireland
Some of the Sinkler family moved to Ireland, but this topic is not covered in this excerpt.
Another 59 words (4 lines of text) about their life in Ireland is included in all our PDF Extended History products and printed products wherever possible.
| Sinkler migration to the United States ||+|
Some of the first settlers of this family name were:
Sinkler Settlers in United States in the 17th Century
- George Sinkler, who landed in Maryland in 1670 
Sinkler Settlers in United States in the 18th Century
- James Sinkler, who arrived in Virginia in 1715 
| Sinkler migration to Australia ||+|
Emigration to Australia
followed the First Fleets
of convicts, tradespeople and early settlers. Early immigrants include:
Sinkler Settlers in Australia in the 19th Century
- Mr. John Sinkler, (Hebden), (b. 1809), aged 35, English hatter who was convicted in York, Yorkshire, England for 15 years for wounding a policeman, transported aboard the "Blundell" on 13th March 1844, arriving in Tasmania (Van Diemen's Land) 
|Contemporary Notables of the name Sinkler (post 1700) ||+|
- William S. Sinkler, American Democratic Party politician, Postmaster at Green Bay, Wisconsin, 1944-64 (acting, 1944-46) 
- Huger Sinkler, American Democratic Party politician, Alternate Delegate to Democratic National Convention from South Carolina, 1916, 1936 
- ^ Cleveland, Dutchess of The Battle Abbey Roll with some Account of the Norman Lineages. London: John Murray, Abermarle Street, 1889. Print. Volume 3 of 3
- ^ Williams, Dr Ann. And G.H. Martin, Eds., Domesday Book A Complete Translation. London: Penguin, 1992. Print. (ISBN 0-141-00523-8)
- ^ The Norman People and Their Existing Descendants in the British Dominions and the United States Of America. Baltimore: Genealogical Publishing, 1975. Print. (ISBN 0-8063-0636-X)
- ^ Black, George F., The Surnames of Scotland Their Origin, Meaning and History. New York: New York Public Library, 1946. Print. (ISBN 0-87104-172-3)
- ^ Bardsley, C.W, A Dictionary of English and Welsh Surnames: With Special American Instances. Wiltshire: Heraldry Today, 1901. Print. (ISBN 0-900455-44-6)
- ^ Dickinson, F.H., Kirby's Quest for Somerset of 16th of Edward the 3rd London: Harrison and Sons, Printers in Ordinary to Her Majesty, St, Martin's Lane, 1889. Print.
- ^ https://namecensus.com/most_common_surnames.htm
- ^ Filby, P. William, Meyer, Mary K., Passenger and immigration lists index : a guide to published arrival records of about 500,000 passengers who came to the United States and Canada in the seventeenth, eighteenth, and nineteenth centuries. 1982-1985 Cumulated Supplements in Four Volumes Detroit, Mich. : Gale Research Co., 1985, Print (ISBN 0-8103-1795-8)
- ^ Convict Records Voyages to Australia (Retrieved 25th October 2020). Retrieved from https://convictrecords.com.au/ships/blundell
- ^ The Political Graveyard: Alphabetical Name Index. (Retrieved 2015, November 19) . Retrieved from http://politicalgraveyard.com/alpha/index.html