Glennan is actually a not uncommon name in Ireland. It is of Scottish origin, and an Anglicized version of Mac Gille Fhinneain. Medieval scholars dropped the 'Mac' (meaning 'child of', and started spelling Gille Fhinneain phonetically. The Gaelic pronunciation of the words sounds sort of like 'gil-hinaan', which in time got shortened to 'glinaan', which is the pronunciation used in the show.
Her full name: Princess Fiona Fiona O_O
Fiona Cheeks's birth name is Larissa Kelley.
Fiona Lincke's birth name is Fiona Mary Lincke.
Fiana Toibin's birth name is Fiona Jude Toibin.
Fiona Bones is 163 cm.
Fiona Coyne .
Fiona Apple - singer
Her full name: Princess Fiona Fiona O_O
Fiona Cheeks's birth name is Larissa Kelley.
Fiona Wood's full name is Fiona Melanie Wood.
Fiona Shaw's birth name is Fiona Mary Wilson.
Fiona Stanley's birth name is Fiona Juliet Stanley.
Fiona Apple's birth name is Fiona Apple Maggart.
Fiona Musson's birth name is Fiona Anne Musson.
Fiona Crossley's birth name is Fiona Mary Crossley.
Fiona Ferrer's birth name is Fiona Ferrer Leoni.
Fiona Dolman's birth name is Dolman, Fiona Jane.