It is a common naming convention for malware or "screamer" files (meant to jump-scare the user).
If you are engaging with this as part of an Alternate Reality Game (ARG) or a horror project: Lisa (25) mp4
Since this is a creative prompt based on internet mystery tropes, 1. The Lore: What is it? It is a common naming convention for malware
Look for hidden text in the file properties (right-click > properties > details). Lisa (25) mp4
Run the audio through a tool like Audacity to see if the visual waveform contains hidden images or messages.