I found quite a few people in history who share my birthday (October 7). Not all of them "cool" but still pretty awesome in their own right.
Vladimir Putin, President of Russia (b: October 7, 1952) - He's Russian, that allows him to qualify.
Heinrich Himmler, Nazi official and leader of the SS (b: October 7, 1900) - Leader of one of the most brutal German military divisions, he qualifies as cool (still evil though).
King Charles XIII (b: October 7, 1748) - He's a king, what more do we need?
John Marston, English writer (b: October 7, 1576) - If you haven't play Red Dead Redemption this might not make sense to you (although it still might).
King Frederick I of Denmark and Norway (b: October 7, 1573) - The king of Denmark and Norway, both places I've always wanted to travel to, not only that but he was the first King Frederick of Denmark and Norway (which makes him clearly superior to the later King Fredericks of Denmark and Norway). He makes the list.