I need a query that returns only the records than are repeated in the
table

example:

Key Name
----------------
1 John
2 Peter
3 John
4 Jason
5 Peter
6 Robert
7 Laura
8 Jenny
9 Adrian

So, the query would return only this records:

Key Name
----------------
1 John
3 John
2 Peter
5 Peter


What sentence can I use for it?

Thx.