numbering names

Hi. I have a column of data with names in it. for example john smith I need excel to number the names so for example john smith produces a 1 in the next column and then each time john smith comes up the next column adds a number to 1

so it would look like this

john smith 1
john smith 2
john smith 3

when the name changes the process would start again. If the next name was jane smith it would produce

jane smith 1
jane smith 2
jane smith 3

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welcome to the forum. say if your data is:
Data Range

	A	B
1	john smith	1
2	john smith	2
3	john smith	3
4	jane smith	1

then in B1:
=COUNTIF(A$1:A1,A1)