Proper file naming is key to successful search optimization for your website, blog or online store. Improving your image SEO will help readers or potential customers find your products or content because your pages, or the images themselves, will rank higher in the search results.
When naming an image file, make sure the name you choose clearly supports or describes the content of the image. For example, if it is an image of a Southwest Airlines jet in Chicago, instead of a file named DREVHJS2.jpg, name the file Jet-Southwest Airlines-Chicago.jpg.
Make sure to add in ALT text as well. This is text that helps search engines understand the content image without seeing it (and what will show up in the event that the image doesn’t load). For the example above, you could use “Southwest Airlines Jet at Chicago Airport”. Keep ALT text short, almost like a tweet.
I recommend reading the Yoast SEO blog for further information regarding image SEO.