This is just a quick dash thru your Turnbulls starting with
Lancelot Turnbul/Turnbull born/baptised in Clyne, Sutherland Scotland in 1814, son of William and Elizabeth ( nee Robson/Robison)
Source IGI and ScotlandsPeople
Lancelot has several children with an Elizabeth in Northumberland...
Jane b circa 1843, William 1845, John 1846, Mark 1848 Robert 1849,Lancelot Allgood Robson, 1853, George 1855, James 1858.
Lancelot A.R and George were born in Bull Bush ( Bullbush) a community in the "township" of Hollinhill, within the Parish of Rothbury.
Census 1851 @ Ritton, (2423-217-7)
Census 1861 @Branton (3893-79A-18)
Census 1871 @ Fleetham (5178-62-28)
Census 1881 @ Crow Hall Farm, Cramlington ( 5094-78-34)
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Census 1891 @ " " (4235-117-3)X 2 families-same page.
Census 1891 West Hartford (4236-163-9) William & second wife.
Matriarch Elizabeth dies 1886, Patriarch Lancelot A dies 1900. Son Archibald A.R dies 1899.
Census 1901 George and family @ Crow Hall (4811-71-1)
Census 1901 Lancelot junior's widow Ann @ Crow Hall (same ref)
Census 1901 William and family @ West Hartford ( 4809- - 24)
Census 1901 Lancelot A (prob. son of William) @ Jesmond (4781-43-34)
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When a large family follows the conventions of the English/Scottish Naming Pattern to name their children , the results are similarly named children down thru generations...
i.e. SCotland-born Lancelot's father was William. Lancelot named his first son, William, after his father- rule 1 of naming pattern.
Son William named his first son, Lancelot, after his own father..
Scottish Lancelot's son Lancelot, called his first son, Lancelot, after his father, not himself.
Scottish Lancelot's son George, similarly named his first son, Lancelot after his dad..
And I would guess the Turnbulls carried this on into the C20th, before the convention died out.
Michael