Also very popular in Belgium.
The irony (as in "ironie du sort" / twist of fate) and the poetic justice of that one is plain delicious: the french have long made fun of the belgian for being fries eater, but the fate of the french is that fries in english are forever going to be known as french fries.
It cracks me up to no end : )
Outside of those places, we call them "Chips" - though they tend to be a lot fatter than 'fries'.
And then 'Chips' is the American name for what we call 'Crisps'.
You say potato, I say potato, etc. ;)
One exception is a type of chips (i.e. crisps) that are thin and rectangular shaped and were quite popular when I was in primary school but you don't really see around much, which had the brand name "French Fries".