Rashi on Genesis 2:13/רש"י על בראשית ב׳:י״ג

1גיחון GICHON — It is so called because it flows on with a roar, its roaring being very noisy,—similar in meaning to (Exodus 21:28) וכי יגח “And if an [ox] gore” — for when it gores it rushes on roaring (Berakhot 59b.).