I'd like to expand on the name/word 'Assur' a bit more, and its meaning.
As you have said, Assur is connected to Asir/Aesir - which is connected to Asura (India) and Ahura (Middle East). In the north, 'ur' became 'ir', also in the name Os-ir-is (Asir-IS). 'Ur' means 'ancient', and 'As' is the original creator beings (the soul group Aesir/Ahura), so 'Ass-ur' means 'ancient creator being'.
Assur was considered the head of the pantheon in Assyria (named after him), also interchangeably spelled Ashur. Ash-Ur relates to the Tree of Life, the Source life network - it is no accident that Yggdrasil, the nordic World Tree was depicted as an ash tree. So his name also denotes one who came in ancient times from the life network of Source, through the Tree (through the nine realms, the nine dimensions).
Ashur was depicted in ancient Assyria as the protector of the Asherah Tree:
The Asherah Tree was the feminine principle of Source (Ash-e-Ra - the Tree of the Light of Source), and worshipped in the ancient Middle East as the wife and counterpart of El, the father/masculine principle. In the above image, Ashur shoots the arrow of Immaculate Conception (the lily-headed arrow) through the Bow/Crescent of the Mother, within the Ring of Life (also symbolically, as a sun god, through the Sun's Ring, the solar portal of Light).
Later on, the priesthood fell into distortion, and they destroyed the Asherah Tree (literally cut down statues and living trees that symbolized Asherah, such as terebinth trees) and erased the Mother principle from their teachings/texts, leaving only El, the masculine part. The worship of Ashur became military/martial, revering the bow of war, rather than the bow of Life, if you feel that twist into lower energies.
Assur/Ashur was often depicted as a winged bull (with a bull's or man's head). Right at the time I was connecting deeply with him and posting about him (in his current 5D soul aspect form as Arnap, brother of Ashtar) ISIL militants broke into the Mosul Museum in Iraq and destroyed the statues in there - including drilling the faces off the winged bulls of Ashur - and then bulldozed Nineveh, the old Assyrian capital. This was exactly at the time the 'Divine Bull' energy was inflowing strongly - the lower masculine 'control' energy reacting against it, albeit subconcsciously. From a galactic/star family point of view, the Bull energy is connected with the constellation Taurus, especially its alpha star Aldebaran (the Eye of the Bull), and the star systems Hyades and Pleiades within it, and from the closely related system of Alpha Centauri, within the constellation Centaurus - Cen-Taurus means 'new bull' (the new bull being a centaur - formerly, some civilizations described Centaurus as a bull). The horseshoe (of the horse/centaur) was seen in ancient Egypt as the Door of Life...and came down through later cultures as a sign of good luck...
The astrological symbol for Taurus, the stylized bull's head (the masculine) is also the Bow or Crescent of the feminine on the Ring of Life, so its a merged whole energy:
'Ashtar', or more fully, Ash'Ta'Hor, means the Hour that brings the energy - of the Tree of Life to land ('Ta' is land, base, foundation, 'Hor' is hour, time), in other words, a soul that anchors/lands the Life energy, in Divine Timing. The Ahura are with us, Novusod, many of them - may humanity see and feel them again, free of distorting beliefs, ego projections, or religions old and new....