I am trying to install oVirt 4.1.x from CentOS repos but it seems ovirt-engine doesn’t exists. But instead, ovirt-hosted-engine-setup exists?
Is ovirt-engine package removed? In the official oVirt repos, exists.
oVirt engine components are not included in CentOS, only dependencies required to set up an oVirt node.
Please use the oVirt repos to install oVirt.
Then, can I use both at the same time under oVirt engine host or only official oVirt repo?
You can and should use both. AFAIK the ovirt-release package that sets up the oVirt repos is shipped with CentOS from one of the extra repos.