Shelagh f
Another Anglicized form of SÍLE (SEE Síle) (see also SHEILA (SEE Sheila)). The final consonants in the written form seem to have been added to restore a Gaelic feel to the name, since they occur at the end of many Gaelic words and are silent. However, they do not have any historically justified place in the name.
Variant: Sheelagh.
First names dictionary. 2012.