I agree it could have something to do with the Crusades. But read this article, I believe, after reading this, it may not necessarily have to do with the Crusades:
Outremer, French (outre-mer) for "overseas", was the general name given to the Crusader states established after the First Crusade: the County of Edessa, the Principality of Antioch, the County of Tripoli and especially the Kingdom of Jerusalem. The name was often used as an equivalent to Levant, Syria or Palestine, and incorporated areas that are today part of Israel, Jordan, Syria, Turkey and Lebanon.
The term could also be used for any other land "overseas"; Louis IV of France was called "Louis d'Outremer" as he was raised in England.
The modern term outre-mer means overseas, and is notably used for the French Overseas Departments and Territories (départements d'outre-mer et territoires d'outre-mer).
I agree it could have something to do with the Crusades. But read this article, I believe, after reading this, it may not necessarily have to do with the Crusades:
Outremer, French (outre-mer) for "overseas", was the general name given to the Crusader states established after the First Crusade: the County of Edessa, the Principality of Antioch, the County of Tripoli and especially the Kingdom of Jerusalem. The name was often used as an equivalent to Levant, Syria or Palestine, and incorporated areas that are today part of Israel, Jordan, Syria, Turkey and Lebanon.
The term could also be used for any other land "overseas"; Louis IV of France was called "Louis d'Outremer" as he was raised in England.
The modern term outre-mer means overseas, and is notably used for the French Overseas Departments and Territories (départements d'outre-mer et territoires d'outre-mer).
article was taken from http://en.wikipedia.org/wiki/Outremer