Lars Schwarz provides a typeface name check on his fontdata.com site. It uses information from various sources to validate if a given typeface name is already taken. The sources include typeface names from digital sources like MyFonts, Typekit, Google Fonts and foundry websites, but also non-digital sources like the so called »Seemann« (»Handbuch der Schriftarten« published 1926 incl. 6 supplements between 1927 and 1939), The Encyclopaedia of Type Faces (Jaspert, Berry & Johnson), Monotype Corp. faces and a list of many faces by American Type Founders. Besides these main sources many font related Trademarks from the USPTO (United States Patent and Trademark Office) are included, too.
