Board Thread:Support Requests - Designing Your Wiki/@comment-7205164-20170613125831/@comment-168424-20170614000428

Put  around your gallery with videos and use the following CSS: div.hide-video-names > div.wikia-gallery > div.wikia-gallery-item > div.title { display: none; }

You may want to test for side effects on images, but it worked to hide video names for me.

I copied part of the gallery to a sandbox and the CSS to Special:MyPage/wikia.css.