From the "Managing cloud recordings" Zoom Support Page
https://support.zoom.us/hc/en-us/articles/205347605-Managing-cloud-recordings

Login to Zoom using the humboldtstate.zoom.us server, and your HSU Login ID.

Navigate to your Recordings.

Select the recording you wish to rename.

Press the pencil icon next to the recording title.

You can rename the lecture to match a convention that makes most sense to you. highlight the current text, then type what you would like to rename to. Press save to finalize changes.

You have now successfully renamed your meeting.