Yes place names are interesting.
I am in Australia and we have Botany Bay;
The great quantity of plants Mr. Banks and Dr. Solander found in this place occasioned my giving it the name of Botanist Botany Bay". Captain Cooks journal
Melbourne
It was incorporated as a Crown settlement in 1837, and named after William Lamb, 2nd Viscount Melbourne, who was then Prime Minister of the United Kingdom**. In 1851, four years after Queen Victoria declared it a city, Melbourne became the capital of the new colony of Victoria.
To answer your question not sure if original records would show any more info, likely not.
Also just because children were bapt same day it does not mean they are twins unless the record states so.
I have a Newby in my Tree but from Northumberland.
Trish

EDIt you made me interested and just looked up origin of Ashby-de-la-Zouch and Appleby Magna place names!