To our knowledge, there currently is no evidence that Merkel cell carcinoma (MCC) is inherited. While DNA changes (mutations) found in the cells of MCC tumors can lead to MCC, these types of mutations are not inherited from a persons parents. They are referred to as somatic mutations and occur during a persons lifetime, often as random events. Sometimes, something in the environment can lead to a somatic mutation, such as long-term sun exposure or infection with the Merkel cell polyomavirus. These are known risk factors for developing MCC. 
Is Merkel cell carcinoma inherited ?