"Sais" is an Englishman, and "Saeson" the English people.
"Saesnes" is an English woman, and "Saesneg" the English language.
It is basically the Welsh for "Saxon". The English word "English" comes from "Angle", and the Angles and Saxons (Anglo-Saxons, collectively) occupied much of what is now England when they invaded Britain in the early 5th century AD.
It means 'English'.
'You' is not a Welsh word.
The word 'fern' is not a Welsh word and has no meaning. The Welsh word for 'a fern' is 'rhedynen'.
It's not a word in Welsh.
'Carley' is not a Welsh word.
It's not a Welsh word.
"Gabrielle' is not a Welsh word.
It's not a Welsh word.
It doesn't appear to be a Welsh word.
Perisgop is the Welsh word for a periscope.
Celyn is the Welsh word for Holly.
'Sorry' isn't a Welsh word so it has no meaning in Welsh.