Haegl is the ninth of the twenty four Futhorc runes carried from the Elder Futhark, its name and reading a close continuation of Hagalaz, whose own name likewise means hail, one of the more stable continuities in the row's second half, both traditions reading the same disruptive winter weather as the rune's core image.
Hagalaz opens the second of the Elder Futhark's own three aettir, the group later rune tradition names Heimdall's or Hagal's Aett, so Haegl's position opening the futhorc's second eight rune section mirrors a structural division the Elder Futhark row already carried, even though the futhorc itself, extended to twenty nine runes for Anglo-Saxon use, does not preserve the aett grouping as an organising principle for its own longer row in the way Scandinavian runic tradition continued to use it.
R. I. Page's account of the futhorc situates Haegl among the runes whose reading stayed close to its continental original, the underlying image of hail as a harsh, disruptive natural force surviving the shift from the Elder Futhark to the Anglo-Saxon tradition largely intact. Page notes the aett division itself is a Scandinavian runic convention with no confirmed equivalent role in Anglo-Saxon practice, so Haegl's echo of that older structural boundary is best read as inherited coincidence rather than a system the futhorc's own users still actively kept.