To call a particular spirit, yes. But there was no woman named "Bloody Mary" unless you're summoning a cocktail, and if you can do that, I want to be invited over! Lol, seriously though. For instance, you can call upon a spirit who knows information about "such and such", and if any spirit knows that information, they may choose to come. You can't force them. It is a big announcment. People often set guidelines, such as "only good natured" or "of destruction", "of air" etc. This doesn't allow you any control over what actually comes which is why experienced people try to use names to specific beings. This means is used more so by amateurs (such as with ouijia boards). By desiring to bring forth a restless woman's spirit who is tormented by her children's deaths...how many women in this world throughout history could fit that description?
I just randomly googled spells and found this, which is a perfect example.
"Thee i evoke I ask for your aid Oh spirit of light The darkness shall fade.
Thee i evoke Protected be I I bind you to me My eternal ally."
Who is this "spirit of light"? A spirit of good nature I'm guessing, one of millions. And people use this spell and bind this random spirit too them! Will this work if used in ritual? Probably. But what spirit of light will they get? Your guess is as good as mine. Kind of like opening a cookie jar, closing your eyes, and grabbing one. You know you'll get a cookie, but it may not be the one you want or the best in the bunch. The more descriptive on is when calling forth any being, the better the results.
And moreover, if it is a thoughtform, then any name associated with that thoughtform will provoke it.