John McWhorter makes a good case that the Phoenecians exercised a strong influence on the proto-Germanic language. So if they left grammar and/or vocabulary, why not DNA? See:
http://books.google.com/books?id=UGOMfGDT3KkC&pg=PT105&lpg=PT105&dq=phoenicians+%22proto-germanic%22&source=bl&ots=9esVNCKZXa&sig=8HCgOvFcFZ1i2eYz05Sv3G0_Zdw&hl=en&ei=RkMsTrOKJcjm0QGk7rzkDg&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCcQ6AEwAw#v=onepage&q=phoenicians%20%22proto-germanic%22&f=false
See :Sea Peoples invade: 1192–1190 BC