The English term "passionfruit" is a direct borrowing, but its French equivalent, le fruit de la passion , is a literal translation meaning "fruit of passion." Interestingly, the name has nothing to do with romantic passion. Instead, it refers to the Passion of Christ , because early Spanish missionaries in South America saw symbols of the Crucifixion in the flower's structure.
Here is a short text about this translation and the fruit itself:
The English word translates into French as "fruit de la passion."