イタリア語のrocchettoから、回転する紡錘、紡錘、花火、ロケット、原語ゲルマン語*rukkonから、振る、回転する、PIE*rugから、回転する、語源的にはrock.-ettoと同じ、短縮接尾辞。花火やロケットの形が紡錘形に似ていることから名付けられた。
That such a feat is considered within the range of possibility is evidenced by the activities of scientists in Europe as well as in America. Two of them, Prof. Herman Oberth and Dr. Franz Hoeff, of Vienna, are constructing a five-ton rocket ship in which they hope to reach the moon in two days. ["Popular Science," Feb. 1927]