rock, crag, cliff echo 1 realization
NEW Realization 1
type Derivation
language Middle Irish
lexeme 1 alla
lexeme 2 mac alla
meaning 1 cliff
direction
meaning 2 echo
reference <personally collected data>
comment

 literally “son of a cliff”. Modern Irish Gaelic macalla 'echo'. Also Irish Gaelic allabhair, Old Irish allabair 'echo' sometimes explained as alla 'cliff' +‎ labair 'speak' or ath- 're-, again' +‎ labair 'speak', but these may be folk etymologies.