2019 iPhone names that could cause confusion
iPhone 10
iPhone 10 plus
iPhone X
iPhone X plus
Since both 10 and X are pronounced ten it would be too confusing for all except in written form. They should retire the numerical naming for 2019 in order to minimize confusion among both customers and employees since if someone tries to a 2019 X they may end up with a 10 instead.
The Three most heavily rumored iPhones is the 6.1 LCD iPhone, 5.8 and 6.5 OLED iPhone X. Those are almost guaranteed to be expected to be announced in September, with the only real parts surfacing have been some glass displays.