My new first name will definitely be Helena nn Laney (Hel-ay-na). I've narrowed down some ideas for my new last name but I'd like to narrow them down more, and I need help with middle name combinations. Ideally, I'd like two middle names, but one is okay. Flow is very important to me though.
My LN will either be Adler, Fleming, Recke (reck-ee), Tanner, or Modell. Fleming and Modell are from my mom's family (not her married name. I was never really close to my stepdad's family, though I did get along with his late father just fine in the brief time I knew him) and Recke is from my dad's family. Adler and Tanner are just names I like.
Some MNs I like, but aren't set in stone:
Rosalie/Rosalind
Bridget
Sylvie
Caroline
Ruth (preferably as a 2nd middle name)
Valerie
Xanthe
Julia
Judith
Gabrielle
Daphne
Vivian
Camille/Camilla
Maeve
Isabel
Noelle
Jane (Family name. Preferably as a 2nd middle name)
Katherine (preferably as a 2nd middle name)
Feel free to mix and match or combine them with other names.
For reference, my siblings are Sarah Theresa, Cassandra Marie nn Cassie, and William John nn Billy/Will.
Let me know if you like anything! Just a quick note on the surname: I feel particularly drawn to Helena Fleming as my favourite of your options. 
