Wikipedia
Eurolengo
Eurolengo is a constructed language invented by Leslie Jones in 1972. He intended that it would become a common European language, "intended as a practical tool for business and tourism."
The vocabulary consists of words borrowed from English and Spanish and made to conform to a consistent phonetic and orthographic system. Critics find a Spanglish flavor to the language, and that "reading is only straightforward if the requisite languages (in this case English and Spanish) are already familiar."
Auxiliary languages in general, and regional ones such as Eurolengo in particular, have faced little support from the international community. As a result, Eurolengo has never had any speakers.