|Suggested Meaning:||Ail Chumhang |
‘narrow rock, cliff or steep place’.
|1st element:||1. Gaelic ail,al ‘rock, stone’ |
2. Gaelic aill ‘rough, steep’
|2nd element:||1. Gaelic chumhang ‘narrow’|
2. Gaelic ding ‘wedge’ ?
|Blaeu Coila (1654):||Aldhing|
|OS Names (1855-57):||Alhang|
|Location:||OS Map Six-inch Scotland 1892-1960|
|Other Early Forms|
|Aldhing (Blaeu,1654), Alhinge (Ainslie, 1797), Allhang, Alhang, Alhinge ( OS Name Book, Kirkcudbrightshire 1848-51)|
Alhang, Alhang Hill
The Ordnance Survey Name Book Survey Ayrshire (1855-57) entry for Alhang Hill reads –
A hill at the southern Boundary of this Parish situated at the source of Afton Water.
Alhang (without hill) is also given as various mode of spelling and indeed it is this form the name appears on OS maps.
1st element|Gaelic aill ‘rough, steep’; Gaelic ail, al ‘rock, stone’
See also New Cumnock Place-Name ‘ail-,al-,aill-‘ 
Sir Herbert Maxwell in “Scottish Land-Names”  identified Alhang and Alwhat as examples of hill names perhaps containing Scottish Gaelic ail ‘cliff’. However, neither of these hills have cliff like features. In his later work “The Place-Names of Galloway” Maxwell drops the reference to cliff and simply refers to them both as hills with his entry for Alhang simply reading ‘Alhang, a hill of 2100 feet‘ .
Of course much of Alhang rests in Galloway, over the county boundary into Kirkcudbrightshire, and it is reasonable to suggest that the origin of the name lies in this side of the boundary.
The entry for Alhang in the Ordnance Survey Namebook, Kirkcudbrightshire 1848-151, Vol. 4 gives the following description along with a footnote of interest.
[Situation] About 2 miles ENE [East North East] of Clennoch. A considerable hill on the farm of Upper Holm of Dalquhairn, its surface consists of rocky and rough pasture. On it is a Trigl. [Trigonometrical] Station called by Trigl. [Trigonometrical] Party “Allhang” this hill forms part of a range with Mid Rig, Ewe Hill &c
The first syllable in this name appears tolerable plain to be the Gaelic Aill, A precipice, a rock or Steep place but the affix, hang, is rather difficult to trace its derivation. I believe it is much changed by the lowland pronunciation.
The reference to Gaelic Aill fits well with Dwelly entries for Gaelic aill ‘rough, steep’ and Gaelic ail, al ‘rock, stone’ ; all of which could be applied to describe similar aspects of both Alhang and Alwhat as well a Allwhannie on the lower south facing slopes of Alhang.
2nd element| Gaelic chumhang ‘narrow’
The remarks above about the difficulty of the tracing the derivation of the hang in Alhang still seem to stand. The early form Aldhing (Blaeu, 1654) suggests that Gaelic ding ‘wedge’  is worthy of consideration; however it is pronounced ‘jeeng’.
Of course in this neck of the woods the ‘hang‘ is pronounced but that’s not to suggest it was a hanging hill or Gallows hill!
However, Michael Ansell in his New Cumnock Place-Names articles in the New Cumnock News suggests that Alhang Hill is probably derived from Gaelic Ail Chumhang ‘narrow rock, cliff or steep place’.
The Ordnance Survey Name Book Survey Ayrshire (1855-57) entry for Alhang Burn reads –
A small stream at the source of Afton Water, and one of its first tributaries.
The burn takes its name from the hill and is the first tributary of the Afton Water which rises between Alhang and Alwhat.
| New Cumnock Place-Names : ail-, al-, aill-|
| Sir Herbert Maxwell | Scottish land-names; their origin and meaning (1894)|
| Sir Herbert Maxwell | The Place-Names of Galloway (1930/ (Reprint 2001))|
| Edward Dwelly | Illustrated Gaelic-English Dictionary (1902-1912)|
| Malcolm MacLennan| Gaelic Dictionary|
| Michael Ansell | New Cumnock News No. 6 Autumn Winter 2020|
|Reproduced with the permission of the National Library of Scotland|
|Map 1| OS Map Six-inch Scotland 1892-1960 | Alhang, Ayrshire|
|Map 2| OS Map Six-inch Scotland 1892-1960 | Alhang, Kirkcudbrightshire|
|Map 3| Johan Blaeu, ‘The Stuartrie of Kirkcudbright, the most easterlie part of Galloway’ (1654)|