I think you're having trouble because your question is incomplete. You presume that there's "one" "domain" for each company. I can assure you that there isn't. And the question is also context-sensitive, since it would depend on what country you are in. Also, "adobe" is useless without the ".com", so you'll need to keep the entire name.
The more you can narrow down your question to the point where it would have the single answers you gave, the more likely you are at coming up with a solution that fulfills an answerable question. Start there.
For example, you could use the Yahoo::Search module and identify the top web hit for each of the companies you list. That would more than likely be correct, but if some company's own website is less trafficked than some other site that talks about them, you might be in for a surprise. But that's where your "human" could come in... present the top five hits on a clickable web interface, and let your human assist in selecting the name.
-- Randal L. Schwartz, Perl hacker
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.