A chara,
Firstly the translation of names will always be a touchy topic, with various different approaches and opinions out there. I like fully translating names, so that is what I'll give you, though this will be by no means the only solution/answer to your query.
Also, I'm taking it that these are double first names? Or are they first names and surnames, because that would be significantly different

Here's giving real Irish names that may appear close, but are mostly eymologically unrelated:
1. Peta Marie --> Peadairín/Piaraisín Máire
2. Marnie Rose --> Muireann Róis
3. Paige Marie --> Peig Máire
4. Taylah Rosetta --> Domhnaillín Róisín
5. Sienna Rose --> Síne Róis
A transliteration approach (save Máire and Róis which are well-established translations of Mary/Rose):
1. Peta Marie --> Péite (Máire)
2. Marnie Rose --> Marnaí/Mairní (Róis)
3. Paige Marie --> Péiste/Péitse (Máire) [péist is worm though, an péitse is an obscure word for a boy-servant/page

(the irish word "páiste", meaning child, comes from page) ]
4. Taylah Rosetta --> Téile Róiséid
5. Sienna Rose --> Siaine (Róis)
A translation of meaning:
1. Peta Marie --> Airtín (Máire) [Petra < Petros = Stone = Art]
2. Marnie Rose --> Muireann/Muirgheal (Róis) [Marnie < Marina = (possibly) of the sea = Muir]
3. Paige Marie --> Cailín* (Máire) [Paige = Page = Giolla (boy-servant), Cailín (girl-maid)] *Literally means "girl" though. America has it as "Colleen"
4. Taylah Rosetta --> Táilliúirín* Róisín [Tayla(h) < Taylor = Tailor (surname) = Táilliúir (surname)] *Really unrealistic as a name, let alone a girl's name
5. Sienna Rose --> Flann (Róis) [Sienna = orange-red = Flann ("red", common Old Irish name m/f]
If I had to pick from them:
1. Peta Marie --> Airtín Máire
2. Marnie Rose --> Muireann Róis
3. Paige Marie --> Peig Máire
4. Taylah Rosetta --> Téa Róisín (Téa is an ancient goddess supposed to have buile Teamhair, the Hill of Tara)
5. Sienna Rose --> Síne Róis