Wikipedia
Sisuile
Sisuile, Gaelic- Irish feminine given name.
Sisuile is a very rare, post- Norman forename, that may or may not be related to Síle (Irish name). It is only attested twice - in Inis Eoghain in 1250, and in County Galway in 1586.
The diminiutive form of Sisuile is thought to have been Seisilín.