为什么有的美国人叫迪克

Dick 实际上是 Richard 的简用名（Nickname）。

Richard 先是缩为 Rich = Rick，然后进一步谐音为 Dick.

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参考英文解释如下：

The first or given name Richard comes from the Germanic elements "ric" (ruler, leader, king) and "hard" (strong, brave).[1]

Richard is a typical english name and can be shortened into a variety of names such as Rick, Rich, Dick etc. These are all generally english abbreviations.

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The boy's name Dick \d(i)-ck\ is pronounced dik. It is of English origin. A rhyming nickname from medieval times. Richard (Old German) "dominant ruler", was shortened to Rick, then rhymed to Dick, and variants like Dickson and Dix (which is also the French word meaning "ten") followed.