First version, to install copy & paste the openrct2-real-rollercoaster-names.js to:
Windows: C:\Users\YourName\Documents\OpenRCT2\plugin
Mac: /Users/YourName/Library/Application Support/OpenRCT2/plugin
Linux: $XDG_CONFIG_HOME/OpenRCT2/plugin or in its absence $HOME/.config/OpenRCT2/plugin
Any time you build a new rollercoaster it should grab a name from an existing rollercoaster of the type that you are building.