|Suggested Meaning:||‘sandy-peat sluggish stream’|
|1st element:||Scots sandy ‘sunny’ or ‘sandy|
|2nd element:||Scots sike, syke ‘sluggish stream’|
|Blaeu Coila (1654):||No Entry|
|OS Name Books (1855-57):||Sunny Sike|
This may be a reference to the sunny south facing position of the sike, but unlikely! It may be a variant of sandy, where sandy peat is ‘a peat containing a good deal of earthy matter ’.
There are two Sandy Sykes in the parish.
A Sike or Syke is described as –
A small stream, rill or water-course, especially one that meanders through a hollow or across flat or boggy ground and is freqently dry in summerDictionary of the Scots Language 
the sheughs and the sykes
Sunny Sike flows into the Guelt Water in the north-east of the parish.
| Dictionaries of the Scots Language |sandy, sunny|
| Dictionaries of the Scots Language |syke, sike|
| The Laird of Logan, Or, Anecdotes and Tales Illustrative of the Wit and Humour of Scotland|
|Reproduced with the Permission of National Library of Scotland|
|Map 1: Ordnance Survey 6 inch (1892-1960) |Sunny Sike|