I have Amen relatives in Northern California/Eureka/Arcata/Shively. Do any of these names ring a bell? I don't specifically have a Matthias or Sarah--in fact I don't have a lot--but it might help. If there were a connection they would be siblings or cousins most likely but I could share whatever I end up finding.
Alexander Ely Amen (b1848) m. Nancy Ann Millsaps. Kids Stella Viola, Hattie Irene and Iva Isabel. I found land use records for him in Eureka/Arcata.
Thomas Amen m. Elizabeth Jane Millsaps(somewhere around the same time as above). No kids. She later remarried a Tobias Atwell and had six children.
James Amen m. Martha Millsaps in 1885. These are mine. Six kids: Clarence Leonard, Henry Alfred, George Albert, William Fredrick, James Alexander, and Claudia Evelyn. These guys are all Humboldt County.