They are common among all people. They have either good sounds and some good meanings, such as Yasmeen, Shaheen, Parveen or Shan, Ihab, Nawaz etc. There is no harm in having these names. I think Natasha is a neutral name and it is common among Muslims and non-Muslims both. I would not call it a non-Muslim name.
Cardiopulmonary resuscitation is a medical treatment.
Its purpose should be only to help in the healing and curing of a patient. A patient can also make such a request. But one should study the documents very carefully before signing. If it is allowed to make such a request, then it is also allowed to honor it. But keep in mind my answer to the question no.3.