Not sure on that, without invoking some vague talk about universal language mumble Chomsky mumble mumble. It could be by chance, but things like the kiki-bouba experiment suggest that the dice loaded, at the very least.

But things that look like cognates with Japanese do exist. Notably そう ("sou") is pronounced the same as English "so" and means roughly the same thing, at least in phrases like "is that so?" and "Make it so, Number One."