It seems the US releases the title is Legacy of Kain Series, The: Blood Omen 2 and in EU it is Blood Omen 2: The Legacy of Kain Series.
Spine title is to be put into alt-name if it contains terms not in the item title. For example, I wouldn't put "Blood Omen 2" in the alt-title because that information is already covered in the item title. You could put into the description field that the spine title is Blood Omen 2.