Archives of leaked data or "lost media" often use the original filenames from the source device.
Right-click the file and select "Properties" (Windows) or "Get Info" (Mac) to see the Date Created . This often helps identify when the video was recorded.
did you see this filename (e.g., a specific website, a text message, or your own hard drive)? What is the estimated size of the file? Are there any other files with similar names near it?