Several surnames are supposed to have derived from the first name Bartholomew. These include Bartle, a short form, and Bartlett, a double diminutive. Actually, the double diminutive seems to have established itself first, with several examples of Bartlett in the 1500s strongly implying two points of origin in south east Cornwall and north east of the Camel estuary.
Examples of the full name Bartholomew are far fewer (in fact only two) but did appear early in the 1500s. Both Bartholomew and Bartlett predate Bartle, which emerged later in the century in the west, although close to one of the earlier Bartholomews.
Around the same time, in the latter part of the 1500s, the form Bartla also turned up. This was restricted to St Enoder parish in mid-Cornwall and at first glance looks like a development of the name Bartle as it moved eastwards.
Yet, in addition, we have the presence of Barkla in and around the same parish, strong evidence for a relationship between the two names Bartla and Barkla. But Barkla seems to be more extensive than Bartla. Did Barkla evolve from Bartla or was it the other way around? If so, what does Barkla mean and does it have anything to do with Bartholomew?
And what about Bartly? (See map 2 above.) Examples of this name preceded Bartle and were spread over a somewhat wider territory. Where does this fit? If anywhere?
Cornish studies resources 
There is also the surname BARKLE which seems to mutate almost completely to BARTLE by the end of the 18thC in places like Gwinear and Camborne. I often wondered whether this was simply a result of the way the name sounded when being recorded in the parish registers by the clerk or vicar. In other words BARKLE was meant to be BARTLE. But then BARKLE is very close to BARKLA! However, I have numerous connections with these names but no evidence of any movement from BARKLA to BARKLE.
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I think these numbers (only 2) are your evidence that Bartle does not stem from Bartholomew in Cornwall. Variants of Bartle high up the tree in Cornwall include Batrell, Bartell, Battrell, and Bottrell — as well as Batterell and Boterel. Sometimes these appear among siblings; other times, there’s a transposing of “Ba” and “Bo” in the records.
There’s a public pedigree by Jeffree & Jeffree (1986) that shows many of these variants, although some individuals married differ on accuracy:
https://search.worldcat.org/title/866496852
They give varients that include:
• Battrell
• Batrell
• Battrall
• Bartell
• Barkle
• Barkel
• Barkell
In Patronymica Cornu-Britannica (Charnock, 1870, p.15), other variants of Botrell are given, such as:
• Botreux
• Bottreux
• Bottreaux
• Botterell
• Botterill
So i think the broader mix of forms, fits a Cornish naming pattern, not one derived from Bartholomew, like in Yorkshire or suggested elsewhere online. Would be interesting to see the patterns/progression of battrell/bottrell/bottreaux as i wonder if Bartle, is an attempt or ultimate outcome of anglicising the formers, and making it more understandable to English ears.
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Yes, there are several examples of Botrell in west Cornwall in the subsidies of the early 1500s (although not the other variants) well before Bartle appears which does make a model of Bartle from Botrell rather than from Bartholomew more attractive.
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