EVO is the "release group" name. In the world of digital media sharing, groups like EVO are known for being the first to source, encode, and "release" content to the public. They add their signature to the end of the filename to claim credit for the technical work involved in fetching the file.
This represents the "High Definition" standard. The 1080p tag confirms a resolution of 1920x1080 pixels with progressive scanning. H.264 (also known as AVC) is the compression codec used to package the video. It is the industry standard for balancing high visual fidelity with a file size that is easy to store and play on most devices. The Audio: DDP5.1 subtitle 1080p.AMZN.WEB-DL.DDP5.1.H.264-EVO
💡 : This string is essentially a "spec sheet" confirming the file is a high-quality, high-definition copy of an Amazon stream with surround sound, released by the group EVO. EVO is the "release group" name