Singoalla : et prosadigt
Translated by Otto Borchsenius. Kbhvn 1895
There is also an anonymous and unauthorized translation from 1866

Singoalla
Transl. by Philippine Wijsman (from the 3rd edition). Amsterdam 1889.

Singoalla : a romance
Transl. by Axel Josephson. New York 1903
Free e-version: Hathi trust

Singoalla : a medieval legend
Transl. by Josef Fredbärj. London 1904 (2 ed. 1908)
Free e-version: Internet archive

Singoalla
Transl. by Juhani Aho. Helsinki, 1895 (2 ed. 1921, 3 ed. 1922)

Singoalla
Transl. by Joel Lehtonen. Helsinki, 1930
In vol.1 of Valitut teokset (Selected works).

Singoalla
Transl. by Josef Fredbärj. Paris 1900 (new ed. with revised translation 1907)

Singoalla : eine Phantasie
Transl. by M L Sunder (from the 3rd Swedish edition). Leipzig, 1885.

Singoalla : skáldsaga frá 14.öld.
Transl. by Guðm. Guðmundsson. Reykjavik 1916

Singoalla : racconto svedese
Transl. by Guiseppe Fredbärj. Pescara 1909 (2 ed. 1912).

Singoalla
Transl. by Ruth Nissen-Drejer. Oslo 1965 (new ed. 1972)
There was also an anonymous translation in 1950

Singoala : novela sueca
Transl. by José Fredbarj. Valencia 1902