Definitely going with [name]Reuben[/name] as a first name, but can’t settle on a middle…looking for Hebrew suggestions. Especially something meaning strong, or courage, or something to do with “ruler”, “warrior”, or “peace” as those are all parts of the name of DH’s grandfather (that we aren’t using). Sibs are [name]Elias[/name] [name]Solomon[/name] and [name]Talia[/name] [name]Hadassah[/name]. Last name starts with Bl—
Go!
[name]Reuben[/name] [name]Paz[/name]
[name]Reuben[/name] [name]Mordecai[/name]
[name]Reuben[/name] [name]Ezra[/name]
[name]Reuben[/name] [name]Oz[/name]
Hebrew names that mean or imply strong:
[name]Eitan[/name] (also spelled [name]Etan[/name], [name]Eytan[/name])
[name]Adir[/name]
Shimshon ([name]Samson[/name])
Yechezkel ([name]Ezekiel[/name])
[name]Gavriel[/name] ([name]Gabriel[/name])
[name]Uziel[/name]
[name]Peace[/name]:
[name]Shalom[/name]
[name]Shlomo[/name] ([name]Solomon[/name])
Ruler/king/prince:
Melech
Sariel
Avisar
Can you share the names you’re not using? There may be variations or something that you’d like better than the originals…
[name]Reuben[/name] [name]Mordecai[/name]
[name]Reuben[/name] [name]Shalom[/name] or [name]Reuben[/name] [name]Salem[/name]
[name]Reuben[/name] [name]Jonah[/name] ([name]Jonah[/name] = dove, symbol for peace)
[name]Cris[/name]
DH’s GF’s name was [name]Freddie[/name] [name]Herbert[/name]. We also have a long list of names we can’t use because someone in our family has them. My father already got on me when DS1’s Hebrew name ([name]Eliyahu[/name]) was the same as my Father’s middle Hebrew name.
I instantly thought of [name]Reuben[/name] [name]Ari[/name] and [name]Reuben[/name] [name]Dov[/name] - [name]Ari[/name] means “lion of God”, and [name]Dov[/name] means “bear”, both of which definitely imply strength! I also love [name]Asher[/name], [name]Aviv[/name] and [name]Michaiah[/name] among Hebrew names, but the meanings may not be exactly what you’re looking for. 
I like [name]Ariel[/name], but DH won’t go for it. [name]Mordechai[/name] is my little brother’s middle name, so we can’t use it 
Last night I was looking for names of Jewish Kings, but [name]David[/name] and [name]Solomon[/name] (the only two with apparently good histories) are already in use in our family. DH has TWO 1st cousins named [name]David[/name] and DS1’s middle name is [name]Solomon[/name].
Toying with
[name]Reuben[/name] [name]Yonah[/name] ([name]Jonah[/name] has too harsh a sound for me, our last name is pretty harsh)
[name]Reuben[/name] [name]Ariel[/name]
[name]Reuben[/name] [name]Ezra[/name]
I am even to the point of searching names of great Jewish leaders…I just don’t [name]LOVE[/name] anything and it sucks…
Chizkiyahu ([name]Hezekiah[/name]) and Yoshiyahu (um…no idea how his name works in English) are considered to have been good kings. If you want the name of a leader, some others from the bible include [name]Jeremiah[/name], [name]Samuel[/name], [name]Eli[/name], [name]Boaz[/name], [name]Joshua[/name], [name]Moshe[/name], [name]Isaiah[/name]… [name]Ezra[/name] definitely counts in that category too. I kind of like [name]Reuben[/name] [name]Isaiah[/name]/[name]Reuven[/name] [name]Yeshaya[/name], the combo works well however you’re pronouncing the names.
If DH doesn’t like [name]Ariel[/name], what about [name]Uriel[/name], [name]Azriel[/name], [name]Aryeh[/name]?
Does DH know what his GF’s Hebrew name was? Maybe there’s something you can work with there. Lots of people have/had Hebrew names that aren’t at all related to their secular ones.
[name]One[/name] good king was [name]Josiah[/name]. I think [name]Reuben[/name] [name]Josiah[/name] sounds nice. There is also [name]Azariah[/name], which was Abed-nego’s Hebrew name. Means help of God.