jorgen melligan or mellingam??

hope somebody can give me some advice or help. I am looking at tracing a distant relative called jorgen melligan this could be spelt slighlty different as milligan or mellingen. I know that he worked as a seaman for 'white star line' and also possibily on the vessel 'empress of canada' arriving into liverpool around 1928/29 and 1942/43. I also know that i lived in Norway (part unknown) and that he was probably born between 1900-1912. At the moment it feels like a needle in a haystack and would really appreciate - many thanks