Belize

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Borrowed from Spanish Belice (attested since 1677) as the name of the Belize River, probably ultimately from Mayan/Mopan Maya beliz(“muddy water(s)”). [1]

The old suggestion that it could be from a corrupted Spanish pronunciation of the surname of Scottish buccaneer Peter Wallace (via pronunciation as *Valis, then *Balise), is now generally considered to be folk etymology; the popularity of the legend persists.