These two profiles on Geni.com have husbands by the name of Halvdan Jarls, same death date, etc. ~ and they appear to me to be a candidate for a merge:
#2: Ingebjørg Haraldsdotter
https://www.geni.com/people/Ingebjørg-Haraldsdotter/600000001044308...
Ingebjørg Haraldsdotter MP
Norwegian: Ingebjørg Haraldsdotter, Halvdan jarls hustru
Gender: Female
Birth: circa 865
Lade, Trondheim, Trondheim, Sør-Trøndelag, Norway
Death: 920 (51-59) Norway
Place of Burial: Norway
Immediate Family:
Daughter of Harald I "Fairhair", king of Norway and ?? ??
Wife of Halvdan Jarl
Mother of Gunhild Halvdansdatter
Half sister of Guttorm Haraldsson; Halvdan Haraldsson; Halftan Haraldsson «the White» Kvite; Sigfrod Haraldsson; Aalov Haraldsdatter and 17 others
Added by: Sherry Klein on March 3, 2007
Managed by: Palle Christensen and 69 others
Curated by: Bjørn P. Brox
#4: Ingegjerd Haraldsdotter
Ingegjerd Haraldsdotter
Ingegjerd Haraldsdotter MP
Norwegian: Ingegjerd Haraldsdatter
Gender: Female
Birth: 870 Norge
Death:9 20 (50) Norge
Immediate Family:
Daughter of Harald I "Fairhair", king of Norway and Åshild Ringsdotter
Wife of Halvdan Jarl
Sister of Ring Haraldsson; Dag Haraldsson and Gudrød Haraldsson Skirja, King on Isle of Man
Half sister of Ingebjørg Haraldsdotter; Guttorm Haraldsson; Halvdan Haraldsson; Halftan Haraldsson «the White» Kvite; Sigfrod Haraldsson and 14 others
Added by:
Jillian on March 18, 2009
Managed by: Bjørn P. Brox and 14 others
Curated by: Bjørn P. Brox