This is for my best friend who’s expecting a little miracle. 
You guys helped me name my baby girl in [name]September[/name], and I turn again to your expertise to help us. [name]Do[/name] you know any names (for boy and girl as we don’t know the sex yet) that mean miracle or something of the same spirit? It can be in any language.
Thanks!!
From Behindthename.com - they have a great “search for words in meanings” function. A search for miracle gives:
ALAZNE f Basque
KARISHMA f [name]Indian[/name]
[name]MILAGROS[/name] f Spanish
[name]MIRACLE[/name] f English (Modern)
[name]NESSA[/name] (2) f Hebrew
The 2 by [name]Nessa[/name] means there’s another origin to the name (I’m guessing this is the fact that [name]Nessa[/name] is a Scottish nickname for [name]Agnes[/name], but I didn’t check).
I also think a little [name]Mira[/name] would be cute for a [name]Miracle[/name] girl, or [name]Mila[/name] for a girl via [name]Milagros[/name].
I’ll look around and see if I find anything else…
Not sure the style you are looking for, but not a ton that mean, literally, miracle - but here’s some I found with similar meanings
GIRL
Alazne ([name]Miracle[/name])
Karishma ([name]Miracle[/name])
[name]Miracle[/name]
[name]Masia[/name] ([name]Miracle[/name] of Jehovah)
Pelia ([name]Miracle[/name] of God)
[name]Grace[/name] (favor or blessing)
[name]Gwynneth[/name] (luck)
BOY
[name]Matthew[/name] (gift from God)
[name]Asher[/name] (lucky, blessed, happy)
A few more referring to specific miracles, if your friend is looking for miracle in a specifically [name]Christian[/name] sense:
[name]Anastasia[/name] - means resurrection
[name]Talitha[/name] - the aramaic word for “little girl” that [name]Jesus[/name] says when he raises the rabbi’s daughter from the dead.
[name]Lazar[/name] or [name]Lazarus[/name] might be good for a boy by a similar route to [name]Talitha[/name].
And for either Jewish or [name]Christian[/name]:
[name]Isaac[/name]: in the Bible [name]Sarah[/name] laughs when she becomes pregnant with [name]Isaac[/name], because she was well past the age of expecting to be a mother, so he was a miracle of sorts.
All best!
[name]Nathaniel[/name], [name]Theodore[/name], [name]Dorothy[/name], [name]Dorothea[/name], [name]Theodora[/name] all have meanings that refer to “gift of god” too.
What about names that mean victory especially if conception was difficult? There are tons of choices aside from the obvious [name]Victor[/name]/[name]Victoria[/name]. I love Segolene, it means “sweet victory” or “gentle, soft victory” unfortunately its really political in [name]France[/name].
Great suggestions so far, thanks! I’ll share them with my friend. 
What about [name]Mirabelle[/name]? It doesn’t mean miracle, but it sounds close enough. Picking a name because it sounds like the word “miracle” is just as good as picking a name that means “miracle” in my book. It’s the intention behind the name and what it means to the parents that define the meaning to me.
I’m particularly fond of the name Pelaiah (pronounced Pah-lie-uh) a biblical name meaning “miracle” which can be used for either a boy or a girl:
My name is [name_f]Grace[/name_f] and it means ‘a gift from God’.
[name_m]Aaron[/name_m] means miraculous. [name_m]Asher[/name_m] and [name_m]Benedict[/name_m] mean blessing.
On the girls side, [name_f]Marvella[/name_f] means miracle. [name_f]Beatrix[/name_f] means blessing.
I have seen authors in baby name books present [name_f]Arabella[/name_f] with the meaning “answered prayer.”
[name_m]Aaron[/name_m] does not mean miracle. And [name_f]Arabella[/name_f] is a form of [name_f]Amabel[/name_f], meaning “lovable”. People, don’t trust baby naming sites other than Behind The Name (including Nameberry, I’m afraid).
Some suggestions:
[name_f]Mirabelle[/name_f], [name_f]Mirabella[/name_f], [name_f]Mirabel[/name_f] (“wonderful”)
[name_f]Constance[/name_f] (“constancy, preserverance”) + [name_u]Constantine[/name_u]
[name_f]Sigrid[/name_f] (“beautiful victory”)
[name_f]Felicity[/name_f] (“happiness, luck”)
Désirée (“whished-for”)
[name_f]Chara[/name_f] (“happiness, joy”)
[name_f]Laetitia[/name_f] (“happiness, joy”) + [name_f]Letitia[/name_f], [name_f]Lettice[/name_f]
[name_f]Joy[/name_f]/ce
[name_f]Asha[/name_f] (“wish, desire, hope”)
[name_m]Benedict[/name_m] (“blessed”) + [name_m]Bennet[/name_m], [name_f]Benedicta[/name_f], Benedicte
[name_m]Asher[/name_m] (“happy, blessed”)
[name_m]Nicholas[/name_m] (“people’s victory”) + [name_u]Nicola[/name_u], [name_f]Nicolette[/name_f], [name_m]Nikolai[/name_m]
[name_m]Matthew[/name_m], [name_m]Matthias[/name_m] (“gift of god”) + [name_m]Matt[/name_m]éa
[name_m]Felix[/name_m] (“happy, lucky”)
[name_m]Vincent[/name_m] (“victorius”)
[name_m]Isaac[/name_m] (“laughter”)
[name_m]Boone[/name_m] - ‘a blessing’
[name_m]Matthew[/name_m] - ‘gift of God’
[name_u]Jesse[/name_u] - ‘gift’
[name_m]Zebulon[/name_m] - ‘exultation’
[name_m]Theodore[/name_m] - ‘gift of God’
[name_m]Asher[/name_m] - ‘happy or blessed’
[name_f]Zoe[/name_f] - ‘life’
[name_u]Vivian[/name_u]/[name_f]Vivienne[/name_f] - ‘life’
[name_f]Eve[/name_f] - ‘life’
[name_f]Dora[/name_f]/[name_f]Dorothy[/name_f] - from [name_f]Dorothea[/name_f] which means ‘gift of God’
[name_f]Enid[/name_f] - ‘life or soul’
[name_f]Abigail[/name_f] - ‘my father is joy’
[name_f]Kalea[/name_f] - ‘joy, happiness’
[name_f]Alaia[/name_f] - ‘joyful, happy’
[name_f]Miranda[/name_f] - ‘wonderful’
[name_f]Ava[/name_f] - ‘life or desired/wished for’
[name_f]Felicity[/name_f] - ‘happiness, good luck’
[name_f]Dalia[/name_f] - ‘fate, luck’