In the High Middle Ages, a vast amount of Arabic texts were translated into Latin. Impressed by Arabic science, various Western intellectuals used Arabic pseudonyms to make their work seem more authoritative. A common pseudonym in alchemy was Geber, a westenized version of Jabir, the greatest medieval (al)chemist. In modern historical research, these authors (from the 13th and 14th centuries) are referred to as "pseudo-Geber".
"The Great World History Book"