Looking for inspiration, please name all the twins that you know:

In my lifetime I have come across:

Hamish and Flora
Lara and Tara
Rachel and Ruth x 2!!
India and Freya
Anna and Rachel
Paul and Debbie
Henry and Hugo

If you have boy/girl twins and go for Christopher and Catherine, you could have Kit and Kat.

[unhelpful]

Sophie and Adam
Ava and Orla

My G/G twins are Sophie and Charlotte.

Another good reason to avoid alliteration is that they would have the same first initial and the same birthday - not good for post or credit references, especially when at the same address.

Tom and Lou

Thomas and Louise

I know an Isobel and Eleanor.
Grace and Olivia
Harry and Archie
Ginny and (ummm)Tonic-y

Olivia and Rebecca

Molly and Devon. Both girls

Joshua and james

Isla & Olivia

Nicholas & Edmond

Max and Anya
Sam and Jack
Won't tell you what mine are as that would out me but I really wanted Nancy and Flora

Laura and Selena
James and Ruby
William and Charlie

Oh and Adam and Melissa.

James and David
Amy and Tracey
Belinda and Jane
Annie and Robbie
Eliza and Lucy
Andrew, Ben and Virginia, known as Ginny (in the unlikely event that one of them has been hiding during scans)

Lily and Harry (age 2)
Adam and Sarah (age 8)

adults
Brent and Travis
Adam and Mark
Rosie and Kirsty

Ciara and Erin
Laura and Ruth
Heather and Andrea
Andrew and John
Amanda and Michelle

Fred and George - aged 12.
Lauren and Kristy - aged 14.
Richard and Jonathan - in their 30's I think.

Babies:
Harry & Olivia
Lily & Annabel

Adults:
Emily & Louise
Marcus & James

And the bastard iPad has christened the child Felixstowe. The parents went for Felix.

Joe and Hal
Marina and Octavia
Finn and Noah
Maddie and Pippa
Tanque and Ray
Rachel and Rebecca
Zachary and Elijah
Ben and Henry
Mary and Emily
Athena and Helena
Amy and Jonny
Charles and John
Ethan and Lloyd
Thomas and Joseph
Martha and Nell

Rowan and Maddie
D'Jon and Ishanna
Libby and Nicole
Louis and Ben
Harry and Luke

Lily and Eliza
Thomas and James
Katherine and Elizabeth
Esmee and Alice
William and James
Edward and Herbert
Frederick and William
Amelia and Sophia
Alexandra and Charlotte
Hannah and Emily
Fraser and Angus
Thomas and Samuel
Thomas and Matthew
Frederick and Arthur
Saul and Dan
Georgia and Helena
Hector and Benedict
Reuben and Henry
Christopher and Jonathon
Lara and Alice
Alexander and Bruno
Freddie and Tom
Benjamin and Harvey
Charles and Conrad
George and Toby

From birth announcements. I'm not a twin convention organiser.

Anthony & Andrew
Jessica & Victoria
Scott & Ellie
Tara & Ewan
Freya & Jake
Finn & Isabella
Noah & Harriet

Invoking EasyCompadre 'explanation, am also not a weirdo, just work with kids!

'Spirit' based names

Xan - vodka from Azerbaijan
Kryshtal Etalon - vodka from Belarus
Minskaya Kristall - another vodka from Belarus
Alberta - vodka from Alberta, Canada
DANZKA - Danish brand of vodka
Viru Valge - vodka produced in Estonia
FRÏS (pronounced "FREEZE") - Danish vodka
Grey (Goose) - vodka produced in France
Jean-Marc XO - vodka distilled in the Cognac region of France
Eristoff Vodka - from Georgia
Zaranoff - vodka, sold in Germany, Belgium and Denmark
Reyka - Icelandic vodka
Wódka ?o??dkowa Gorzka - Polish vodka
Pyatizvyozdnaya - Russian vodka
Citadelle - French gin
Hendrick's Gin - from Scotland
Uganda Waragi - gin from Uganda

Any of those take your fancy?!

Daisy and Beatrice
Florence and Matilda
Alexa and Saskia
Rory and Arthur
Johnnie and Charlie
Arthur and Tristan
Samuel and Frederick
Harvey and Jasper
Nina and Felicity
Harry and Johnny
Isabel and Honor
Archie and Noah
Leo and Joshua
Alexander and Harrison
Isabella and Sophia
Harry and Freddie
Beau and George
Emma and Elizabeth
Lucas and Sebastian
Oliver and Henry
Frederick and Hector
Sophie and Alice
Digby and Herbie
Thomas and Robert
Ines and Esther
Alexander and George
Caspar and Felix
Isabella and Matilda
Archie and Jasper
Honey and Claudia
Harold and Henry
Lara and Florence
George and Johnnie
Emily and Katharine
Jemima and Willa
Frederick and Oliver
Isabella and India
Edward and Samuel
Olivia and Amelia
Edmund and Henry
Charlotte and Esme
Andrew and Euan
Molly and Honor
Henry and Sebastian
Daisy and Lucy
Alice and Heidi
Isabella and Jemima
Ava and Sofia
Maja and Elsa
Sophie and Isobel
Oliver and Jonathon
Wilfred and Edmund
Oscar and Erin
Flora and Olive
Ilsa and Rose
Irene and Rose
Alicia and Rose
Marina and Rosanna
Samuel and David
Louis and Gus
Thomas and Felixstowe
Dylan and Georgia
Edward and Patrick
Anastasia and Eloise
Holly and Elspeth
Freya and Martha
Kit and Jude
Theo and Henry
Maud and Olive
Otto and Will
Sofia and Naomi
Ophelia and Alice
Tabitha and Poppy
Tom and Ben
Honor and Imogen

Sheila and Barbara (old)

Mark and Sally (in their 40s)

Jessie and Cassie (in their 30s)

Carlo and Bruno (7ish?)

Twins at nursery:

Ben and Elliot

Zac and Angelina

Scout and Hugh

My imaginary twins would be Daphne and Rufus