Originally Posted by atulhost
Is it allowed by google or bloggers to us Keywords in the field of Name while commenting on a blog post? Or is it treated as spamming?
That would be up to the admin, or moderator, of the blog to determine whether your comment is approved or not.
Usually when you leave a comment your name links to your site.
I have used my business name on occasion when commenting.
If you provide a useful, intelligent, comment, other readers are more likely to click to your site.
Using a keyword as your name would only benefit the location you are posting on anyway, and probably do you more harm than good.
You're better off spending your time on good "white hat" SEO as opposed to borderline maneuvers.