system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How do we know what Wookiee names are when they can't even form consonant sounds? Chewbacca never said anything even resembling his own name, let alone Lumpawaroo, Mallatobuck, etc.
gpt
Transliteration and mispronunciation.

Take a look at Chinese pinyin (transliteration from Chinese characters to Latin alphabet), for example. Yixing is a city in China known for its clay. Except it's name isn't Yixing, but 宜兴.  The accepted pinyin spells it Yixing even though there is neither a 'Y' nor an 'X' sound. It should be pronounced ē-shing, except not quite. The 'sh' has a slight 'j' sound to it. It isn't uncommon to hear less knowledgeable people refer to the famous Yixing teapots as 'yix-ing.'

The 'ch' in Chewbacca could be the transliteration of a specific growl in Shyrriwook that many other species cannot easily pronounce. They picked something close and the other species ran with it.