Shrug, I've never had the problem. My company name is my company name - that's what I use. But my company name is my official LLC or INC or whatever - it's not a keyword stuffed domain name. So it's a good thing for the blogs, it shows that real companies in the industry are commenting.
All the blogs I comment on are active, subject to high amounts of spam, and highly moderated.
In short, if you're using 'SEOcompaniesIndia" as your company name, that's a problem. If you're using 'SEOmoz" as the username, I don't know why that would be a problem - I've never seen it.
Basically they're trying to stop keyword stuffing. My company name isn't keyword stuffed, so it's OK. And I back it up with 3-5 paragraphs or relevant information (not just commentary).