With such amazing descendants from Julie, it seems justifiable for folks to claim her as their own!
Right so back to this...I'll try not to get too wonky with the history..but Indians came to the British Caribbean islands in the 1800s to replace the sugar plantation workers that were by then emancipated African slaves. These Indians were indentured laborers, and while not technically slaves were still somewhat forced laborers.
Anyway, they brought with them many things including the mango and their mango cultural practices. Most went to Trinidad, Guyana and Jamaica (in that order), but much like their African predecessors,immeidate families in some cases were separated between the islands.. As British colonies there was much trade back and forth between the island colonies with Jamaica and Trinidad being the two largest population and cultural centers, goods (including plants and produce and including mango ) moved back and forth between the islands...And Jamaica and Trinidad specifically had long, similar and connected mango histories and practices from their Indian populaces, which again, included closely related family members and people from both islands that could trace their lineage to often the same exact villages in the old country.
So noone knows exactly who selected the famed St. Julian (Julie) mango, and like with many things amongst these two islands (including sports, music, politics etc), a friendly but often fierce rivalry persits as to who actually invented the Julie.
Full disclosure: Jamaican mango lover, with one parent from Trinidad (of half east indian descent), the other from Jamaica, spent lots of my formative years in both, grandparents on both sides were agriculturalists..So I've heard first hand stories from people from both places who actually knew indentured Indian laborers from one generation before them from the late 1800s, who claim the famed Julie from both islands.
Noone can say for certain.