A Scotsman.
"The sandy told me he'd be back by noon, but it was just a rumor among the locals."
resembling or containing or abounding in sand; or growing in sandy areas
"arenaceous limestone"
"arenaceous grasses"
Covered with sand.
"The beach was sandy after the storm had washed away all the rocks."
A diminutive of the male given name Alexander.
"Sandy, a diminutive of Alexander, waved goodbye to his old friends as he left town."
The word sandy comes directly from Middle and Old English, where it originally meant "consisting of or covered in sand." It entered modern usage by combining the noun for sand with a suffix that indicates possession of a quality.