HI give my first list the once over.

Boys

Angelo - poncey
Alexander - nice
callum - OK if you're scottish
Leo - not my favourite
Dylan - OKish
Matthias - not great
Micheal - spelling issue
Ronan - OKish
Tristan - OKish
Theodore - like Theo a lot
Xavier - my fav of your boys' names
Ronan - repeated

Girls
Alexandra - quite nice - do you have a nn in mind
Adelheid - no
Aurora - no too Disney princess
Gwendolen - no
Gwenevere - no
Juliet - love it
Marylou - Country and western singer
Natalya - great if you're Russian
Vivien - nice
Winifred - too old lady and not in a good way
Zara - OKish

Angelo -No
Alexander - Love it
callum - It's ok
Leo - Love it
Dylan - Magic Roundabout!
Matthias _like it
Micheal - it's ok
Ronan - Different: Love it
Tristan - Like it
Theodore - No
Xavier - No one will know how to say or spell it

Alexandra -Love it
Adelheid - FFS are you joking. Awful.
Aurora -Love it.
Gwendolen - she'll get Gwen which isn't great
Gwenevere - Why not
Juliet - love it.
Marylou - Don't like it.
Natalya - Like it
Vivien - A bit old sounding
Winifred - Don't like it/
Zara - Love it

Angelo -only if you're mediterranean
Alexander- he'll get called alex
callum- verging on chav (but that's maybe just in scotland)
Leo- the blairs' son, too liony
Dylan- a bit common, of the moment
Matthias- trying t hard
Micheal-did you mean to spell it like that?
Ronan- little seal- lvely
Tristan- i like but can be seen as v posh
Theodore- getting a bit trendy, I imagine a fat child
Xavier- good but also a bit continental

Girls
Alexandra- lovely, lots of nns
Adelheid-weird
Aurora- great
Gwendolen-ugly
Gwenevere-same
Juliet-is so so
Marylou- noooooo, v american
Natalya- love it with an i instead of y
Vivien- too muchlike vinegar
Winifred-ugly
Zara-prefer Sarah

Boys

Angelo - sorry, dont like it.
Alexander - really lovely - would you call him Alex?
callum - I immediately think of Callum Best
Leo - dont like it
Dylan - nice
Matthias - ooh lovely. also love Matthew
Micheal - fine but meh to me as Irish and know about 1600
Ronan - lovely
Tristan - I dont like this at all! but Im the only person I know who has anything negative to say about this name so maybe just me.
Theodore - lovely (Theo as a nn?)
Xavier - I dont like it.

If I had to choose, Im stuck between Theodore and Alexander - lovely.

Girls
Alexandra - lovely
Adelheid - awful
Aurora - ooooh really lovely
Gwendolen - dont like
Gwenevere - dont like
Juliet - beautiful
Marylou - dear God no!
Natalya - no.

Vivien - em.. ok.
Winifred - absolutely terrible, terrible, terrible
Zara - I dont know why, I have an irrational dislike of this name but I know its perfectly lovely I cant pinpoint why I dont like it so much.

Stuck between Aurora or Juliet - (how about Aurora Juliet as first and middle name actually - that is stunning!!!)

i like
Bronwen/Bronwyn nn Bronny
Bronagh
Rhiannon

Dylan
Iestyn
Efan

I like

Alexander
Leo
Dylan
Matthias
Michael (only if spelled 'ae')
Tristan
Theodore
Xavier

Alexandra
Aurora
Gwendolen
Guinevere
Juliet
Natalya
Vivienne
Zara

I like the following from your names:

Alexander
Callum
Dylan
Michael (changed spelling)
Tristan

Alexandra
Gwendolen
Juliet
Vivienne (changed spelling)
Zara

I like Aurora and Angelo.

It's Theodore (Theo) and Aurora for me! ..lovely! x

I would have LOVED to have had dd4 so that I could use Vivienne - absolutely beautiful name!!!! (I had ds1 instead!)
Ronan or Tristan from the boys list

Angelo - like
Alexander - like
callum - no
Leo - like
Dylan - like
Matthias - not sure
Micheal - like
Ronan - not that keen
Tristan - like
Theodore - like
Xavier - like but will it be annoying having to spell it for people

Girls
Alexandra - like
Adelheid - like
Aurora - not sure
Gwendolen - love
Gwenevere - love
Juliet - like
Marylou - no
Natalya - no
Vivien - like
Winifred - love
Zara - no

These are the ones I like ...

Alexander
callum
Leo
Dylan
Matthias
Tristan
Theodore
Xavier

Alexandra
Adelheid
Aurora
Gwendolen
Gwenevere
Natalya
Vivien
Zara

Are Guinevere and Winifred the same basic name? Or am I barking up the wrong tree...

Plus Zara...

Angelo - nice
Alexander - nice
callum - nice
Leo - lovely
Dylan - lovely esp if you're Welsh
Matthias - lovely
Micheal - Michael? Lovely if spelled right
Ronan - a bit meh
Tristan - wet
Theodore - lovely
Xavier - nice

Girls
Alexandra - nice (usually ends up as 'Allie' though, so it runs into the very popular Ellie/ Millie juggernaut)
Adelheid - lovely, love Adela too, not keen on Heidi though
Aurora - Disney (no)
Gwendolen - lovely
Gwenevere - lovely
Juliet - Beautiful
Marylou - meh
Natalya - Beautiful
Vivien - lovely
Winifred - a bit too olde fashioned
Zara - lovely

Leo, Dylan, Micheal,Matthias, Theodore
and Juliet, Natalya Vivien, Adelheid, Gwendolen, Gwinevere are my favourites.

I went to school with a Vivienne, she was so classy! I'm now gutted I didn't name any of my 3 daughters it!

I like Alexander, Dylan, Tristan, Theodore and Xavier for a boy, Alexandra, Aurora, Juliet and Zara for a girl.

Angelo - OK
Alexander - like
callum - OK
Leo - OK
Dylan - like
Matthias - not too bad but does sound like you were trying to avoid Matthew
Micheal - not too keen
Ronan - no
Tristan - like
Theodore - like
Xavier - like

Alexandra - lovely
Adelheid - dislike
Aurora - like
Gwendolen - no
Gwenevere - no
Juliet - very nice
Marylou - silly
Natalya - nice but prefer just Natalie
Vivien - don't like
Winifred - no
Zara - like