I found an Anton Mikael (Mikko) Suominen, who migrated to US in August, 1907. He was born on Sep 28, 1884 (baptized on 29th) in Kustavi, which is a smaller place near Turku. He did sail from Turku and his parents were Gustaf (Kustaa) Adrian and Karolina Wilhelmina. His father actually used the surname KALLIO, not Suominen. Kustaa and Karolina Wilhelmina had seven children. Karolina died in 1896, Kustaa remarried and they had another four children. I attach two images from the church books.
Anton Mikael is "Susan Nikko Susminen" in the EllisIsland.org database: http://www.ellisisland.org/search/passRecord.asp?pID=1056400...
He did not have the name Thomas in Finland - maybe he took that name in the US. It seems possible that this is the same person although all details do not match. What do you think?