Harald

Olav had [six or more] illegitimate children by unknown mistresses:

2. RAGNALD (-1165 or after). The Chronicon Manniæ et Insularum records that “Olavus filius Godredi Crovan” had many concubines by whom he fathered “filios tres…Reignaldum, Lagmannum et Haraldum et filias multas”[1322]. King of Man. The Chronicon Manniæ et Insularum records that “Reginaldum fratrem Godfredi” seized the throne but was defeated four days later by Godred who returned from Norway and blinded and emasculated his brother[1323].
3. LAGMAN. The Chronicon Manniæ et Insularum records that “Olavus filius Godredi Crovan” had many concubines by whom he fathered “filios tres…Reignaldum, Lagmannum et Haraldum et filias multas”[1324].
4. HARALD. The Chronicon Manniæ et Insularum records that “Olavus filius Godredi Crovan” had many concubines by whom he fathered “filios tres…Reignaldum, Lagmannum et Haraldum et filias multas”[1325].
5. daughter . The Chronicon Manniæ et Insularum records that “Olavus filius Godredi Crovan” had many concubines by whom he fathered “filios tres…Reignaldum, Lagmannum et Haraldum et filias multas”, adding that one daughter married “Sumerledo regulo Herergaildel”[1326]. Balfour Paul names her "Ragnhildis" but he does not cite the corresponding primary source[1327]. m SOMERLED Lord of Argyll, son of --- (-killed in battle 1164).
6. daughters . The Chronicon Manniæ et Insularum records that “Olavus filius Godredi Crovan” had many concubines by whom he fathered “filios tres…Reignaldum, Lagmannum et Haraldum et filias multas”[1328]. The precise number of Olav’s daughters is not known.

http://fmg.ac/Projects/MedLands/SCOTTISH%20NOBILITY.htm#OlavMandied...