I am an even number. I am greater than 50. When you count by tens you say my name. What number am I?

There is no definite answer

there are many even numbers greater than 50, and when you count by 10's, there are still many (but 9/10's less)

since an even number multiplied by an odd number=even and when you count by 10 you are really just multiplying by 10 and 10 is even

any 10 above 50 will work

so the numbers could be

60,70,80,90,100 ...