Bridge of Cally derives its name from the stone bridge spanning the Ardle and may be regarded as a main entrance to the Highland Glens.
Place name research for Cally House offers the following information:
OG calath + OG ˗in
‘Hard place’ or ‘at a hard place’. While on the face of it, the current spelling and the early forms for nearby Rochallie (q.v. above), might suggest a meaning of ScG coille ‘wood, woodland’ – early forms for Faskally near Pitlochry PER include Foscailye 1505, Fascalzie 1615. However, the earliest forms for Cally – Kalathyn in 1214 × 1238 and Calady in 1326 – suggest a name based on Pictish *caled, from a Proto-Celtic *kaleto-, ‘hard’. The Old Irish form of this was calath, developing into calad and caladh (Watson 1926, 456). The earliest form seems to contain the OG –in ending ‘place of; place at’, so common in pre-1300 documents and later reducing to an –ie, or -y ending, such as Abernethy (Abyrnethyn 1093 × 1107 St A. Lib., 116; Abernythy 1210 × 1212 Arb. Lib. i no. 214). Quite what was ‘hard’ about Cally is not clear; the word is found in places all over Scotland containing names like Calder, Cawdor, Keltie, and possibly Callander PER. However, these names all relate in some way to rivers in that they are named after a river or they are near rivers which have some kind of ‘hard’ attribute. It may be that Cally takes its name from some perceived hardness in the River Ardle, or, alternatively, the name relates to the hardness of the ground; perhaps it was thought rocky or difficult to farm when it was named.
Another possibility is that the name is ScG calltainn + aidh ‘hazel place’.