In the Hiski index, Mickel Mattsson Sjöblad, from Eurajoki, married Johanna Johansdotter in Rauma in 1845 and they had Johanna in 1846 and Johan in 1849, in Eurajoki.
Rauma - Raumo - married
Announc. Married Village Farm Man Wife Village Farm
2.11.1845 Euråmn: Kaukomäki Junnila Drg. Mickel Mattss. Sjöblad Trp dtt:r Johanna Johansdr. Sorka Tiilivuori Heinilä
Eurajoki - Euraåminne - christened
• Father's last name: SJÖBLAD => Sjöblad
Born Christened Village Farm Father Mother Child
1.11.1846 2.11.1846 Kaukom. Junnila Drg Michel Sjöblad Johanna Johans:dr 23 Johanna
24.6.1849 25.6.1849 Kaukom Suonperä Trp Michel Matts:s Sjöblad Johanna Johs:dr 25 Johan Erland
4.6.1896 Irjanne s.176 Juho Erland Sjöblad v:o Amanda Lovisa Mårtenson 42 Elsa Maria
So it looks like we have two different people, or did Michel Sjöblad move around a lot and marry twice?
I think we need more input. From Närpes to Rauma is about 100 miles. Not impossible for an able-bodied seaman, of course...