Initially I have concentrated on the English/British Attridge's, working my way to the next 'largest' dataset that I can find, however, I am now ready to start collecting and looking at the surname worldwide. 

Misspelling such as Atridge I will include.. I suspect that there are other variants, but until I have collated a substantial body of data, I will hold back from making any judgements.

One such potential variant is that the surname Attridge in South Frambridge, England , seems to have moved to Australia and become Artridge. I'd very much like to test this theory out with a Y DNA test. 

The suggestion from using webpages such as GBName profiler, lead me to have an initial hypothesis that for the most part, Chelmsford Essex England, is a potential place for the locational name Attridge. 

This however, doesn't preclude the progenitor gaining the name elsewhere, moving to Chelmsford and then settling down.

Of course, this does also imply I think that the name is a sole progenitor hypotheses.. I'm willing to accept that this might not be the case as in it seems that this is in fact a rare case. 

http://gbnames.publicprofiler.org/Statistics.aspx?name=ATTRIDGE&year=1998&altyear=1881&country=GB&type=name

This website suggests that the frequency per million in 1998 is 792. And in 1881 440. 

This places the study in the medium size study, albeit in the lower range. 

Data collected on my side so far :

Census Records for England & Wales 1841 > 1911

Birth Marriage and Death Records 1837 > 2005

London Electoral Register records 1835 > 1965

British Phone Books 1880   > 1984

I myself have taken 3 tests so far. The first at 23andMe, the second at Ancestry and recently I have taken a Big Y 700 test at FTDNA.  

A Paternal Cousin has taken an Ancestry Autosomal test and I have matches triangulated with her, that show a connection to a 4th and 5th Generation Attridge Ancestor.

FamilyTreeDNA Attridge Project