Hello, this is kumar speaking!

I don't like 'Devi' being listed there, but for a different reason. I take it as a lack of domain knowledge.

I don't like it because I don't consider 'Devi' as a last name or surname, although technically it is.

In India, when you know a girl is married and a little old, you don't want to call her by her first name, you add devi after her first name to show respect. Though in big cities people don't follow it.

I suspect the data might show 'Devi' as the most common last name because, when married women from villages registered for an Aadhar card (similar to a Social Security Number) over the last 20 years, the person assisting them invariably added 'Devi' as a last name.

Footnote:

'Devi' means Goddess. Kumar is also not 'technically' a last name