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By naming their company Haven, leaders of the health venture formed by Amazon, Berkshire Hathaway, and JPMorgan Chase & Co. sought to create a brand unlike anything else in American medicine — a business uniquely capable of sheltering customers from insurance hassles and unreasonable costs.

There’s just one hitch: Dozens of other companies already use the same name, including a large handful that deliver or facilitate health services, according to a review of registrations on file with the U.S. Patent and Trademark Office.

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