Líosain is a gaelicised form of the English surname Leeson;
they came to Ireland about 1680 and became brewers.
Mag Shamhráin is the Irish spelling.
The Irish spelling of 'Sheila' is Síle. It is originally derived from Cecilia.
It's probably Irish. It looks like an anglicized spelling of Pádraig. But most Irish Patricks have adopted the English spelling.
As its not an Irish name there would be no Irish spelling for it
Phil Leeson died in 2004.
Patrick Leeson was born in 1915.
Patrick Leeson died in 1997.
John Leeson was born in 1943.
Spencer Leeson died in 1956.
Spencer Leeson was born in 1892.
Robert Leeson was born in 1928.
Leeson House was created in 1966.