Why are there Numbers before names?

I am working on the Family Tree.

Yesterday I came across numbers before names. I will give you some examples of what I found. The following people are all great great +++ grandparents of mine from England.

10 Richard Tuffery

13 Robert Coxhead

13 Anne Smith

15 John C. Smith 11

16 John Compton Smith 1

Please excuse my ignorance. I am hoping someone can educate, enlighten me as to why the numbers. Thanks in advance for your help.

Cheers Ally

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