Wow, somehow never thought that the device is named after the fruit. Their names can be even closer in other languages, f.e. in Russian they are nearly the same word, just different genders.
Pomegranates are from Granada. In French, Granada is "Grenade" and pomegranate is "pomme grenade", which directly translates to Granada apple
as a french I absolutely never heard "pomme grenade" for the fruit, just "grenade" directly
may depend where you're from. I'm a French speaker and it's always been "pomme grenade" everywhere I have been.
No. "Pomegranate" comes from the Latin "pomum granatum," the 'fruit having many seeds.' Granum means grain or seed, and granatus is a pseudo-participial form (like "mentulatus") meaning 'endowed with seeds.' Granada, the city, likely derives its name from Arabic.
In Polish it is literally the same word, "granat", which does function as weapon, fruit, and color (oddly enough, dark blue).