We might make it even worse :-)
Maria and Selma have the patronymicon Svensdotter in CD Emibas, when leaving Sweden
Maria left the parish in March 1879 and Selma in March 1882.
Maria was born in Habo and Selma in Blidsberg. Below is the records from Emibas that can be used to dig deeper in the two sister's naming mystery
Post 619612
Svensdotter, Emelia Maria
Dotter (unmarried woman)
b. 10/21/1862 in Habo, Skaraborgs län (Västergötland)
Emigrated 4/23/1879
from Smedslyckan Tåsteboängen, Börstig, Skaraborgs län (Västergötland)
to Amerika
Source: Household Examination Roll, p. 75
Emibas migration file ID: Börstig R 1879 002
Post 619657
Svensdotter, Selma Albertina
Dotter (unmarried woman)
b. 4/30/1866 in Blidsberg, Älvsborgs län (Västergötland)
Emigrated 3/21/1882
from Smedslyckan och Tåsteboänge, Börstig, Skaraborgs län (Västergötland)
to Amerika
Source: Household Examination Roll, p. 74
Emibas migration file ID: Börstig R 1882 009
Looking into CD Emigranten gives us the information that they travell as Maria Bergström from Börstig, leaving Gothenburg April 25 1879, source code 13:137:6517 ansd Selma Bergström from Börstig leaving Gothenburg April 7, 1882, source code 19:445:9223