Is there a way to search online for an image by its name?

You have the name of the file? Try running it through Flickr.com

http://www.tineye.com/ provides reverse-image searching.
You can enter the image URL, or upload the image itself.

I’ve had some success finding an image just with a basic google image search. That’s not working for you? If you actually have the name of the file, the exact file name it was given by the site that posted it, the site you downloaded it from, e.g. if the file was called “Fresh-Mandarin-Oranges.jpg” and if the file is still on that site, or somewhere online with that exact name, you should be able to find it, at least I have had success sometimes with that method. It’s the “exactness” of the name that makes all the difference, I think. If you can’t find it that way, it may because the image has been removed from the host site.

Try adding ”image name”, the results should be more accurate.” ” weeds out all the partial results google loves to return.

I found it! At first, tinyeye didn’t work because my copy of the image was corrupted. Then, however, I realized I had downloaded another image from the same site around the same time. So when I uploaded that second image, it eventually led me to the site where I had found both images.

Thanks, everyone! I’ve had previous success with all the methods suggested (except searching Flickr, which I had never tried before). For some reason, they just weren’t working this time. But hey, we got there in the end!