My homemade plugin is trying to update to someone else’s plugin

Do not rely on changing plugin details to work around this issue. The code that decides a match in official repository is a black box — they don’t disclose how it works and what it considers, except in very general terms. Even if it ignores your plugin today, who knows if it will do the same tomorrow?

Any WP site that runs non–repo extensions needs to properly and definitively block possibility of their breakage from invalid updates.

Personally I got tired of the issue and made my own wheel for it as Update Blocker plugin. I am sure there are more alternatives around.