I’ve already asked for sister suggestions, so here’s the boy version!
I find [name_f]Isadora[/name_f] a very hard name to find sibling names for. For me it’s strong, a little bohemian, a little upper crust and generally spunky yet pretty. I feel like it balances a lot of elements which makes it difficult to find other names that compliment it. I’d like to bring out the ‘alternative’ vibe in [name_f]Isadora[/name_f], rather than any feeling of ‘precious-ness’.
I’m just looking for your initial thoughts as, style wise, my taste in boys names is all over the place! (From [name_u]Phoenix[/name_u] all the way to [name_m]Barnaby[/name_m]!)
Here are some names that I really like with [name_f]Isadora[/name_f]:
*[name_f]Isadora[/name_f] & [name_m]Leopold[/name_m]
[name_f]Isadora[/name_f] & [name_m]Rafael[/name_m]
[name_f]Isadora[/name_f] & [name_m]Arthur[/name_m]
[name_f]Isadora[/name_f] & [name_m]Gabriel[/name_m]
[name_f]Isadora[/name_f] & [name_m]Nicolas[/name_m]
*[name_f]Isadora[/name_f] & [name_m]Hector[/name_m]
[name_f]Isadora[/name_f] & [name_m]Edwin[/name_m]
*[name_f]Isadora[/name_f] & [name_u]Lionel[/name_u]
[name_f]Isadora[/name_f] & [name_m]Hugo[/name_m]
[name_f]Isadora[/name_f] & [name_m]Augustin[/name_m]
[name_f]Isadora[/name_f] & [name_m]Maximilian[/name_m]
*[name_f]Isadora[/name_f] & [name_m]Frederick[/name_m]
*[name_f]Isadora[/name_f] & [name_m]Ferdinand[/name_m]
*[name_f]Isadora[/name_f] & [name_m]Edmund[/name_m]
*[name_f]Isadora[/name_f] & [name_m]Charles[/name_m]
[name_f]Isadora[/name_f] & [name_m]Gustav[/name_m]
[name_f]Isadora[/name_f] & [name_u]Florian[/name_u]
*[name_f]Isadora[/name_f] & [name_m]Benedict[/name_m]
[name_f]Isadora[/name_f] & [name_m]Peter[/name_m]
[name_f]Isadora[/name_f] & [name_m]Philip[/name_m]
*[name_f]Isadora[/name_f] & [name_m]Leopold[/name_m]
[name_f]Isadora[/name_f] & [name_m]Cornelius[/name_m]
[name_f]Isadora[/name_f] & [name_m]Augustus[/name_m]
[name_f]Isadora[/name_f] & [name_m]Marius[/name_m]
[name_f]Isadora[/name_f] & [name_m]Fabian[/name_m]
[name_f]Isadora[/name_f] & [name_m]Lucius[/name_m]
[name_f]Isadora[/name_f] & [name_u]August[/name_u]
*my favourites
[name_m]Leopold[/name_m] (which @opheliaflora mentioned, twice) was my first thought, he makes so much sense with [name_f]Isadora[/name_f]. I also agree with a lot of her other suggestions, [name_m]Hector[/name_m], [name_m]Rafael[/name_m], [name_m]Lucius[/name_m], [name_u]Florian[/name_u], [name_m]Augustin[/name_m]…
Others:
[name_m]Theron[/name_m]
[name_u]Zephyr[/name_u] / [name_m]Zephyrin[/name_m]
[name_m]Artemas[/name_m]
Valnetine
[name_m]Casimir[/name_m]
[name_m]Cosimo[/name_m]
[name_m]Jupiter[/name_m]
[name_m]Ludovic[/name_m]
[name_m]Orlando[/name_m]
[name_m]Peregrine[/name_m]
[name_m]Sirius[/name_m]
[name_m]Stellan[/name_m]
[name_u]Taliesin[/name_u]
[name_m]Ignatius[/name_m]
[name_m]Valerian[/name_m]
[name_m]Amias[/name_m]
[name_m]Aloysius[/name_m]
[name_m]Amadeo[/name_m]
[name_m]Corentin[/name_m]
Emeric
Faramond
[name_m]Hadrian[/name_m]
[name_u]Constantine[/name_u]
[name_m]Inigo[/name_m]
[name_m]Llewelyn[/name_m]
[name_m]Lucian[/name_m]
[name_m]Thaddeus[/name_m]
[name_m]Sylvester[/name_m] / [name_m]Silvester[/name_m]
[name_m]Ptolemy[/name_m]
[name_m]Phineas[/name_m]
[name_m]Quinlan[/name_m]
[name_m]Aurelian[/name_m]
[name_m]Malachy[/name_m] / [name_m]Malachi[/name_m]
[name_m]Felix[/name_m]
[name_m]Hermes[/name_m]
[name_m]Crispin[/name_m]
[name_m]Caradoc[/name_m]
[name_m]Barnabas[/name_m]
Bathasar
Berengar
[name_m]Apollo[/name_m]
[name_m]Alasdair[/name_m]
@dearest maybe the more I mention it the more she’ll like it 
[name_f]Isadora[/name_f] and…
[name_m]Julian[/name_m]
[name_m]Basil[/name_m]
[name_m]Damon[/name_m]
[name_m]Peter[/name_m]
[name_m]Lucius[/name_m]
[name_m]Edmund[/name_m]
[name_m]Roderick[/name_m]
[name_m]Thaddeus[/name_m]
[name_m]Zebulon[/name_m]
[name_m]Marcellus[/name_m]
[name_m]Jasper[/name_m]
[name_m]Ivan[/name_m]
Thanks everyone! Haha @opheliaflora I do actually really like [name_m]Leopold[/name_m]! Good shout 
I would encourage you not to feel too restricted with your selection. The two names don’t need to really have the same vibe. There can be beauty in the juxtaposition of eclectic names.