This page http://en.wikipedia.org/wiki/Arkanoid
explains quite nicely relation between Breakout, Arkanoid and other games:
Many clones of Arkanoid have been produced. The most famous Arkanoid clones are probably Krakout (1987), Traz (1988) and Krypton Egg (1989). Freeware game Bananoid got some attention on IBM PC due to its scrolling VGA graphics. Amegas (1987) on Amiga is historically very important since its music was the first piece of tracker/MOD music ever produced.
Since Arkanoid itself is a clone of Breakout, these games could also be called Breakout clones. However, the flood started with a conversion of Arkanoid, and many players in the late 1980s had not even heard of Breakout. Also, many of these games parodied Arkanoid directly, and thus included many features that appeared only in Arkanoid and not in Breakout.