"small fragments," 1810, colloquial, smiddereens, from Irish smidirin, diminutive of smiodar "fragment," perhaps with diminutive ending as in Colleen. The short form smithers is attested from 1847.
Entries linking to smithereens
Colleen
fem. proper name, from Irish cailin "a girl, a little girl," diminutive of caile "girl, woman."