It took me a very long time to find my ancestor Gustav Schultz. He appeared in the census as a farmhand shortly after he came here but I could never find him in a ships list even though I knew the day he came to the US. Eventually I found an obituary that listed a Half Brother. His mother had remarried and he was listed under his step fathers name on the ships list. It occurred to me the same situation may cause what looks like a young person coming by themselves and as stated earlier they could have come with an aunt or other extended family with a different surname.