This mod brings both m_aFirstOpName and m_aSecondOpName to 400 from the default 125-ish adjectives or nouns in the pool, for more operation names than you'll ever need. It should be noted it does not touch m_aFirstOpWord or m_aSecondOpWord. It is compatible with savegames, but I'm not sure for savegames that use it once it has been removed.

Most are adjectives for the first, nouns for the second, and I've tried to keep them mostly within the realm of reason.

INSTALLATION:
Backup XComGame.int from XCOM 2/XComGame/Localization/INT/XComGame.int
Unzip and replace XCOM 2/XComGame/Localization/INT/XComGame.int

This is incompatible with any other mods that replace XComGame.int, if you wish to use it in conjunction then simply copy the m_aFirstOpName and m_aSecondOpName sections from this mod and replace the sections of the mod you wish to use it with.