> Founder and CEO Hans Dockter has said that he originally wanted to name the project "Cradle". However, to make the name unique and less "diminutive" he instead chose "Gradle", taking the "G" from the use of Groovy.
I expected as such, and Wikipedia confirmed it for me.
It’s a build tool for Java, and Android then too, I guess?
Correct. Gradle is the standard build tool used for Android apps.