Sibling for Harriet

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I have a daughter called Harriet (nn Hattie) and am looking for ideas on sibling names.

Some names I like...

Freya
Sophia
Millie

Charlie
Archie
Finley
(Middle name will be Frederick)

Thanks

Imogen
Thea
Lydia
Phoebe
Evie
Flora
Emily
Annabel
Eliza

Jasper
Toby
Milo
Barney
Theo
Max

Liberty. Libby and Hattie

Oh sorry didn't see you was looking for a boys name too.
Jacob
Caleb
Nathan

Although I actual know a man named liberty who goes by Libby x

I know a Harriet with sister Ruby

Emmeline
Jessica

Jack
George

Both the ones I know have a sister called Charlotte.

I hardly know any Harriets which is a surprise. I love the name.
The only one I know has a sister called Antonia.

How about:
Eleanor
Miranda
Camilla
Amelia

Joseph
Thomas
Edward

My first thought was Charlotte. Love Freya from your list! I like Charlie too.

Alexandra
Helena

Harriet says English patrician classic in style to me (a la Jane Austen) with a sweet vintage nn in Hattie. So of your choices I think Sophia and Charles (Charlie) are lovely and fit best with Harriet.

Other ideas (sorry for any repeats) :
Georgina (Georgie/Ginny), Imogen (Immy), Florence/Flora, Camilla (Milly), Emilia (Milly), Rosalind/ Rosamund (Rosie), Clara, Julia, Annabel (Annie), Caroline (Carrie/Callie), Catherine (Kitty).
William (Billy), Peter, George, Edward/Edmund (Teddy/Eddie), Arthur (Artie), Louis, Albert (Albie/Bertie), Robert (Bertie), John (Johnny/Jack), Tobias (Toby), Samuel (Sam).

Thank you all

My cousin has a Bridget and a Harriet

The Harriets I know have siblings called Lucy, Iris, Oliver and Joseph.

Of your list, I like Sophia and Charlie.