Sarah's brother could be called..

[IgglePiggle4Tea]

Sorry, we're really struggling! Two syllable surname beginning with a hard D.

I was going to say Daniel before knowing about your surname! Joseph, James and Harry spring to my mind.

Samuel
Thomas
Patrick
Laurence
Issac
John (nn Jack?)
Noah
Michael
Matthew
James
Luke
Robert
Nathaniel
Alistair
Alexander
Christoper
Tobias
Nicholas
William
Max
Guy

I’m glad Sarah is having a revival

Patrick
Finley
Lucas

Peter

Thomas
Joseph
Matthew
Lucas
Nathaniel
Jonathon
Sebastian
Rufus
George
Quentin
Nicholas
Benjamin
Theodore
Zechariah
Luke

I’m a Sarah and my brothers are Paul and Mark.

Thomas/Tom? All the Sarahs I know are lovely!

Sarah is a classic name that's not too popular nowadays. I think these boys names would go very well

Andrew
Christopher
Quentin
Peter
Dominic
Vincent

James
Henry
Martin
Ian
Christopher
George
Loius
William
Harry
Oliver

Hugo

James

David.

Alexander
Guy

Sarah and
Thomas
Daniel
Andrew
Michael
Ethan
Alexander
Jack

I'm a Sarah and my brother is Thomas, its funny how much that has been suggested

Simon

James
Lucas
Matthew
Thomas
Callum
Robert
Duncan
Oliver

Henry

James

James George

Hugo or Huw is good too

Benjamin
Matthew
Luke
John
Peter
Thomas
Alexander
James
Joshua
Robert
Joseph
William
Jack
Jonathan

Thank you for all the lovely suggestions, plenty to digest! There's definitely a good few here that we'd consider for sure!

Edward
Jake
Lucas
David
Michael

Peter, Matthew, Mark, Daniel (maybe not with the D sound), Edward