Originally invented as trade language by merchants, the Silver Speech has since been adapted by all kinds of Wanderers. While most countries still have their own primary language, with over a dozen main languages and numerous more spoken by smaller groups, it is no great exaggeration to call the Silver Speech the primary language of all Folk. As new Beasts but also various resources are discovered occasionally, the need arose over time for a unified management of the language. Various merchant guilds would work together to discuss things and occasionally spread 'corrections'. As the Wayfarer Guild rose to power, this responsibility slowly became ours to manage.
I live the name for the language as Silver Tongue which brings to mind "Silver Tongued Devils". Nicely done.
There's a reason that's considered a derogatory name for it. =p
Too low they build who build beneath the stars - Edward Young