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The book would be my first thought - it's still in print & the old film makes it onto family 'best of' lists. Wikipedia says Williamson invented the name: https://en.wikipedia.org/wiki/Tarka_the_Otter
Unless these people are actually related to him, I doubt Tarka Cordell had any influence. I'd never heard of him & it looks like he was an old school pal of some famous peeps, not a celebrity himself.