From: https://www.portlandoregon.gov/parks/61985 "Kʰunamokwst Park... pronounced KAHN-ah-mockst " The page has a link to an audio clip... Listening to it I'd probably write kawn a monkST... Less Kahn (as in Star Trek) more like lawn... That said I really have no clue other than the page listed.
Nobody I know knows how to pronounce the name. They all refer to it as the "K" park.
https://www-oregonlive-com.cdn.ampproject.org/v/s/www.oregonlive.com/portland/2015/04/new_khunamokwst_park_set_to_op.html?amp_js_v=a2&_gsa=1&outputType=amp&usqp=mq331AQA#referrer=https%3A%2F%2Fwww.google.com&_tf=From%20%251%24s&share=https%3A%2F%2Fwww.oregonlive.com%2Fportland%2F2015%2F04%2Fnew_khunamokwst_park_set_to_op.html
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