In France we use toto and tata. At least it's easier to see those words as examples. As a teenaegr, learning some languages, I thought using foo & bar was mandatory. Very confusing.
Comments like "xyz is easier" forget that we aren't all the same.
Foobar applies to most of my code.
example: 胖胖 (pàng pàng) "fat fat," nickname for a fat child in the class (generally considered a compliment.)
Chinese speakers are also (according to my teacher) very fond of the English "Bye Bye" for goodbye, since it follows the same pattern, and will use it in place of 再见 (zài jiàn) "again see" if they know you will understand it.
Amusingly, Polish uses pa for goodbye (not infrequently doubled up) and tata for father.