Buon Onomastico or, the Serendipity of Italian

What is an Onomastico, and Why is it Important? “Buon onomastico!” read a Facebook post a few years back on the page of a cherished Italian cousin, followed by several people of the same first name who were tagged with well-wishes and congratulations (auguri). I had no idea what an onomastico was, but I was…