By comparison, anyway, "Leaf" looks pretty good. While iSomething, or 'e', is derivative and quickly dated. Who would even think of naming a technology product iSomething as if you found this Internet thing just last week.
A measure of EVS going mainstream will be that you don't name them anything distinctive. You name them like a car.
I get the impression that VW may be deliberately going for weird branding and styling precisely _because_ the eUp and eGolf (apart from the names) were _too_ car-like; they really looked almost identical to the petrol variants, and I think for about a decade people didn't realise that VW made electric cars at all. A lot of people thought the ID.3 and 4 were their first EVs.
Hyundai also seems to have done well with their notably-weird-looking Ioniq series. It seems like, at least for the moment, the markets actually want electric cars to be a bit weird.
A measure of EVS going mainstream will be that you don't name them anything distinctive. You name them like a car.