Ema
There is a list of Pakeha/Maori transliterations for names here:
http://freepages.genealogy.rootsweb.ancestry.com/~sooty/Pakehamaori.html
The Māori translation for Emma is Ema.
The Maori translation for "Shane" is Hēni.
The Maori translation for "boy" is "tama."
koiora
The Maori translation for "great" is "nui."
The Maori translation of the word 'unique' is 'nohinohi'.
The Maori translation for book is "pukapuka."
wharehokohoko
kuini
Hapani.
The Maori translation for "boy" is "tama."
Miraka
koiora
Yes, you can use websites like Google Translate or Maori Dictionary for Maori sentence translation. These websites can provide you with translation of words and sentences from English to Maori and vice versa.
The Maori translation of the word 'unique' is 'nohinohi'.
the?
There probably isn't a Maori translation because Barry is an English name ( of Irish origins). But there might be a transliteration.
"Ngā hoa ataahua" is Maori for "beautiful friends."