Hello Bengt,
I am related to the Gyberg Family from Åmål.
The Patriarch, Lars Gyberg Sr. Born 22 Oct 1768 in Ljungby, Kronoberg - Death 9 Jan 1846 in Åmål.
Lars Gyberg Sr. had 4 Sons with the surname Gyberg born in Åmål, oneof these sons possibly may have fathered Maria Sophia Gyberg.
One Son died young so that will narrow your search down to 3 of the Sons.
The eldest son Anders Petter Gyberg (1798 - ) had several children, and He had a daughter named Wilhelmina Gyberg (26 May 1833 - ) born in Åmål.
Possibly He may have fathered Maria Sophia? He is my Great Grandfather, and my family is not aware that He had other children outside the family.
Lars Gyberg Sr. was married to Cajsa Bergman Born 23 Mar 1763 in Åmål - Death 14 Jan 1843 in Åmål:
Their children all born in Åmål:
1) Anders Petter Gyberg (1798 - ) Twin
2) Anna Sofia Gyberg (1798 - 1801) Twin
3) Johannes Marin Gyberg (1800 - 1801)
4) Sven Jacob Gyberg ( 1802 - )
5) Lars Gyberg Jr. ( 1805 - )
Anders Petter Gyberg was born 14 Oct 1798 in Åmål.
He is married to my Mormor's Mormor; Maria Maja Hansdotter born Nov 1791 in Mo, Ãlvsborg
( I have a photo of Maria Hansdotter Gyberg)
Their children are as follows and all born in Åmål:
(Please note the oldest 2 daughters also have the surname Lindbeck, the same last name as the Gyberg's Neighbor, which leads me to believe that the first 2 girls might be adopted or fostered possibly.)
1) Anna Maria Lindbeck (1807 - 1830)
2) Carolina Linbeck (1819 - )
3) Lars Daniel Gyberg (1823 - )
4) Maja Cajsa Gyberg (1824 - )
5) Anders Gyberg (1825 - 1827)
6) Anna Lisa Gyberg (1827 - )
7) Laura Gyberg (1829 - )
Anders Gustaf Gyberg (1830 - )
9) Wilhelmina Gyberg (26 May 1833 - )
10) Octiliana Gyberg (1837 - 1880) ( Octiliana is My 2nd Great Grandmother and I also have a photo of her.) Mormor's Mormor
Also of Interest the families mentioned above regarding Gyberg, Per Erik 1848 Father from Minerva, Norrtälje descend from Anders Petter Gyberg's eldest Son, Lars Daniel Gyberg of Åmål.
Lars Daniel Gyberg (1823 -) married Sofia Andersdotter Lindgren, born 18 Mar 1813 in Alster, Värmland.
Their children are:
1) Carl Fredrik Gyberg
Birth 4 Jun 1843
Death 5 Jul 1892 in Åbo, Finland
2) Per Erik Gyberg
Birth 19 Sep 1848 in Uvre Ullerud, Värmland, Sverige
Death abt 22 Apr 1921
3) August Gyberg
Birth abt 1850
I hope this is helpful, Robin