i could be wrong, but 7 = K sounds more like the Major system than Dominic. It sounds like you are then using Major to come up with initials for people.
I don’t know of any links, but I’ll try to make a better job or explaining it.
If, for example, your 31 is Margaret Thatcher (former British Prime-Minister) then the following numbers would all be British PMs (or maybe just British politicians): 310, 311, 312, 313, 314, 315, 316, 317, 318, 319.
You can think of 311 as British Prime-Minister + T which then might lead to Tony Blair. Or it could be 31 + D which might then produce Benjamin Disraeli.
UPDATE: Here are some links: