I think you may be right. It works well, is made for use, but likely not purpose-made for any particular boat or ship. I don’t know of too many shipping companies which would be willing to rebuild a ship under the name of one that went down. Too many superstitious sailors.
There was a more modern SS Atlantic liner from the 1950s that was converted from a C4 Class freighter:
http://ssmaritime.com/ss-atlantic.htm