I would say that it would still be xenomorph, since it is an xeno but with a few traits taken from a yautja & other members have said there is pretty much no difference in the predalien except the mandible trait, but it still has a second jaw, etc.
A good thing to check would be if there is a mix between a Lion and Tiger's scientific names if a Liger is bred.
EDIT:(wont let me edit(error) so i deleted my post, then put this on it and reposted.)
I found that there is no official scientific name for a liger, but it is said to be "Panthera leo/tigris"
I guess ill stick with my 'still a xenomorph' thought.
And i also found a good alien info site that is like Anchorpoint Essays.
Site