Like for example, your theme could be "nature" and your kids are called "Ocean" and "Sylvian" etc..
Or maybe, your boy is called Joe, like your DH and your DH's dad etc..
For us, we want names that start with the same letter as the dad's name.
EvilTwins
Sat 21-Nov-09 17:44:51
Theme? Um. No. Didn't do that.
Mine are biblical,
David, Samson and Lilith
dizzydixies
Sat 21-Nov-09 17:45:46
not a theme as such but all 3 girls have long names that we use shortned versions of and 2 middle names honouring friends/family iyswim?
flashharriet
Sat 21-Nov-09 17:47:57
Short - it really helps when writing Christmas cards 
hippipotamiHasLost75lbs
Sat 21-Nov-09 17:49:33
No theme, just names we liked. Ds's name had been a favourite for years before we even conceived him. Then when pregnant with dc2 we just made sure we had a shortlist of names which 'fitted' well / 'sounded' well alongside ds's name. But no theme. (although both names start with a (different) vowel and are 3 syllables long)
MrsVik
Sat 21-Nov-09 17:50:28
Our first isn't even born yet - but her middle name will be Rowan. We're thinking of maybe sticking with a tree/plant theme for future children's middle names. Or maybe not!
nannynobnobs
Sat 21-Nov-09 17:51:03
I have simple girls' names that are not fussy but not dull. Ella and Lola. I think they go well together.
CroftRusedski
Sat 21-Nov-09 17:52:49
Well, it wasn't a deliberate theme, but I realised when dc2 was already named that they were both names of fairly recent British tennis players.
forehead
Sat 21-Nov-09 17:57:29
OP please don't give your children names that begin with the same letter. My uncle has seven children and their names all begin with the letter F, which caused a great deal of problems when the children were growing up, for example accidently opening a siblings letter etc. My uncle actually ran out of names beginning with F and as a result his youngest SON was saddled with the name Faith.
First 3 have A at end, next 3 have Y at end!
All mistake (the names, that is) 
forehead Thanks but im planning to stop after three children! And there has never been any problems in our family with that "theme"
Christian, Charlotte, Christopher
Alain, Adrian, Astrid
Martin, Michelle, Max, Matthew
Bleatblurt
Sat 21-Nov-09 18:03:04
Scottish Kings. Wasn't totally deliberate (2 are family names) but once the first two were named after royalty we had to do the same for our third. 
LadyOfTheFlowers
Sat 21-Nov-09 18:04:19
My 3 boys have short, simple, 4 letter names, which obviously only have 1 or 2 syllables.
DD1 due in April will also have a short name - we like them. I find they sound clear when shouted in an emergency! 
notagrannyyet
Sat 21-Nov-09 18:38:33
Well mine all have saint's names
.
Do know 2 families with several DDs who have gone with a floral theme.
busybutterfly
Sat 21-Nov-09 18:48:37
Ours are royalty.
Wasn't a 'theme' as such, just names we like!
And no, DS's are not William and Harry... 
Biblical but not intentionally
Royalty here too. Wasn't deliberate, but they were classic names we liked.
The DSSs are:
Alexandre (Alexander the Great)
Guillaume (William the Conqueror)
DD is Flora (Goddess of Flowers)
We are a highly gender differentiated family...
Yes, my theme was names that I liked too.
Ours are the only names we could agree on
DD is called my favourite girls name though
GossipMonger
Sat 21-Nov-09 19:09:08
short one syllable names for boys
if I had had girls they would have longer 3 syllable names
No theme as such
A woman I know has a Lewis, Lexi and Lily which is too twee for my liking.
ten10
Sat 21-Nov-09 19:11:00
our 'theme' was -
Traditional, but not too popular
with two syllables
and not ending in 'son' seeing as surnames has this ending
JANEITEisntErudite
Sat 21-Nov-09 19:11:17
Rory - Lilith is gorgeous.
We have a vaguely Hebrew theme in that mine, dp's and dd1's are Hebrew names (purely coincidental) and dd2's is derived from a Hebrew name.