There is also Ubuntu Core [0] (my install uses 140MB on disk, 25MB RAM). It has no installer, so you have to do everything yourself — from partitioning to boot loader installation.
Google has been taking action against this genericization since 2003.[1] They also got the German dictionary Duden to change their "to google" Definition to refer to Google only.[2]
[0] https://wiki.ubuntu.com/Core