For firebird, https://www.cnet.com/tech/tech-industry/mozilla-holds-fire-i... and https://www.cnet.com/tech/services-and-software/mozillas-fir... in this case it was AOL Time Warner that owned the Firebird trademark for the database.
2) For Phoenix, https://web.archive.org/web/20070914035447/http://www.ibphoe... the main reporting on it seems to be lost but wikipedia still backs it up