The data used was that in my records as of 7 January 2021, although the website build date at the bottom of this page may be more recent.
I have earlier published further Analysis of Glanvilles Distribution at Glanville Surname Distribution
The surnames GLANFIELD (the most common variant being GLANDFIELD and spelling errors such as GLANFEILD) and GLANVILLE
(the most common variant being GLANVILL, GLANVILE and phonetic spelling such as GLANFILL) both stem from the same origin, but in all the records
I've researched since Parish Records began they have not been used interchangeably.
Therefore, I have treated them as two distinct branches with different characteristics.
The GLANVIL(L)(E) branch is about 7 times more numerous than the GLAN(D)FIELD branch, since parish records came into existence.
I have chosen to plot events in two different ways; Heads of Branches and Marriages...
Heads of Branches...
I have identified, within each family branch, the earliest known both dateable and locatable event - usually a birth/baptism, a marriage or a death/burial.
If one of the latter two, clearly there was an earlier birth but unless it is both locatable and dateable, I have used the known event information.
Care should be taken not to confuse these maps with the locations of families, these are only the locations of the Head of a Branch.
It is clear that the earliest events in both East Anglia and the West Country are spacially diverse, showing there were multiple
families living separately in the 1500 and 1600s - which is what would be expected for descendants of an individual arriving 500 years earlier.
What is more significant than the spread within the West Country and East Anglia, is the marked absence from virtually everywhere else - I believe this shows the families remained relatively local (i.e. within Counties) for many generations, with a single or small migration across the country well before parish records became established.
The Glanvilles are much more numerous than the Glanfields, but like the Glanfields, in early records they are only found in distinct regions - in fact there are only branches originating in London, Baldock Hertfordshire and Brighton Sussex prior to 1600, apart from those shown in the South West.
However, there are many branches found all over the UK, when all timeframes are considered.
As an alternative to plotting the heads of each family branch, I have also plotted each locatable and datable marriage. My coverage post about 1950 is less thorough than earlier records as these pertain to people potentially still living - nevertheless, as merely the marriage location does not identify individuals, where I have such records they are included.
Naturally, the marriage locations approximate to the locations of heads of branches, but whereas a whole branch only has a single head, larger branches will have multiple
marriage events and these may have occurred in different locations, which would appear in the above maps.
Due to the large number of marriage locations, it is necessary to plot marriages by century on separate maps in order to see clearly.
The final map contains a count by county of all marriages without regard to time.
Glanville marriage locations show how, over time the family branches grew out of principally the South West through the London and Oxfordshire areas,
with some of the East Anglians changing their surname from Glanfield in the 1600s.
The plot across All Dates though, shows that although Glanville families were becoming dispersed across many marriage locations, in terms of numbers, the vast majority of marriages remain in the South West with significant presence in London/Middlesex.