The spelling of the name "Gillianna" can be explained with IPA phonetic transcription. The first syllable is pronounced with a "g" sound followed by a short "i" sound, represented by /ɡɪl/. The second part of the name is pronounced with a long "ee" sound, represented by /iː/. Finally, the last syllable features a soft "anna" sound, represented by /ænə/. Therefore, the correct spelling of this name includes two "l's" and two "n's," as the pronunciation suggests.
The name "Gillianna" has no clear etymology as it is a modern invented name and does not have roots in ancient languages or cultures. It appears to be a combination of the names "Gillian" and "Anna", both of which have separate etymologies.
The name "Gillian" is of English origin and is derived from the Old French name "Julien" or "Jillian", which itself comes from the Latin name "Julianus". "Julianus" is a derivative of the Roman name "Julius", which was a Roman family name, possibly derived from the Greek name "Ioulios" meaning "youthful" or "downy-bearded".
"Anna" is a name of Hebrew origin, derived from the Hebrew name "Hannah" or "Channah", meaning "favor" or "grace".