[ZeroGravitas]

Do the Indian and Bangladeshi communities have different customs regarding surnames that would lead to a more homogenous naming. Because the results seem disproportionate and shrink massively if you move the slider to the 2nd most popular name or further.

[notahacker]

The map is actually a reasonably accurate reflection of where the largest communities of Asian British and South Asian immigrants live.

That said, whether it's disproportionately common amongst Indian ethnic groups or otherwise, you won't meet that many Patels even in the relevant parts of London. To put things into perspective, the population of Greater London is ~7 million, and there are <100,000 Patels in the entire UK sources: http://gbnames.publicprofiler.org/Statistics.aspx?name=PATEL... http://www.telegraph.co.uk/news/uknews/5040755/Britains-most...

If you want a better picture of the relative sizes of UK ethnic groups by district (amongst many other demographic factors) then the interactive map at www.censusprofiler.org is awesome.

[StrawberryFrog]

Informally, that seems to be true. See Patel: http://en.wikipedia.org/wiki/Patel