Indeed, to prevent confusion, everyone can view a member's display name history inside his/her profile. It's one of the options in the "Profile Options" drop-down box in the profile view. When clicked, it'll pop up with any applicable name changes, so if you don't recognize someone you can check there.
Not much else to say... Just thought I'd mention it.
Page 1 of 1
Can View A Member's Display Name History
Page 1 of 1