There are only two browser engines that were completely based.
First was Gecko, and then the second is KHTML.
[In fact, Bliss(Chrome engine) forked from KHTML]
Discussion
WebKit started as a fork of KHTML and KJS in 2003. (My recollection is that many at the time were surprised as they were expecting apple to use Gecko).
In 2013 Google forked WebCore,a component of WebKit to use it in Chrome under the name Blink.
Yep. It was Blink. Did not really remember the name correctly.
Chrome is basically a fork of an KHTML & KJS fork.