Thanks everyone!
Still got roughly 10wks to go, so plenty of time!
I know Frigg, it might sound odd. Because it's a name I hear in Iceland and which I won't connect with the English word 'radar' because my first language is Icelandic. I love the name, but it might not fit in English. I'm not sure what to go with. I mean, it's not a thing you'd get teased about, what kid really makes that connection between radar- if the name was Smelly, then there'd be a point obviously. But it might just not fit. We live in Wales if it matters.
Thanks Brandy. I love Effron now. Very beautiful meaning. My other DCs middle names means 'melody', 'beautiful song' and 'flute'- so something like that would fit, although only DH and I (and people like you of course) would know the meaning.
Luther could be a difficult name. For a start, Martin Luther King and Martin Luther. I'd assume they'd named the child after one of them, which would seem odd to me, if it wasn't an Icelandic name so I didn't know it, and I was with the parents of a boy called Luther. Also, the accent probably isn't a good idea- mind you, my real name has weird signs over the 'a', but I grew up where that was common.
Which probably means November is off the list, for the accent and because it's a month. A lovely Autumn month, although possibly early winter and wet, but a month- who'd name a baby January or September? So November is off.
Now we've rethinked the whole thing though. Sorry! Two middle names. An English or Welsh name and a Hebrew name. However, the middle Hebrew name is still the same, so it doesn't matter much.
I'm starting to pick out my favourites, some of you seem to think of the same names as me-
Hanna Zemira. Hanna is a pretty name in my opinion, and more to the point isn't too Icelandic to not fit in, but is still an Icelandic name. Zemira (I think) goes okay with it.
Lilja Shoshonna/h. Lily for short? I like Shoshonnah now. A pretty meaning for it. 'Lily'. Although I've found conflicting meanings- lily, graceful lily and rose. In which case she'd be a Lily Lily, a Lily graceful lily or a Lily Rose.
Isak Aharon. I like this a bit more name. Although I agree it sounds like Isadora, I like the name. I'm falling in love with Aharon too.
Does Fenrir sound a bit too fierce for you? Or maybe it's just me? I like the name but it sounds a bit ferocious almost?
Jesper Elan is a possibility. Jes? I can imagine calling him Jess or Jesse when he's little- so about 2- but not sure when he's older. Maybe when he writes his name on forms etc; they might think the 'e' is an 'a'- depending on handwriting it's easy to think he's a Jasper. Although I'm just overthinking it now.
I really, really wish we'd chosen to find out the gender now. Lovely to have a surprise, but a nightmare to find names.
So out of that shortlist-
Hanna Zemira
Lilja Shoshonna
Isak Aharon
Possibly Fenrir Isaiah
Possibly Jesper Elan
DH and I need to find English or Welsh names too. Argh! Our other DCs have Icelandic names and Jewish names, although their ones are the English version (such as Judith) but we'd like it this way. Thanks for all the previous suggestions, they really helped us narrow the names down! 
Hanna Zemira Elenor/Eleanor
Hanna Zemira Madeleine (does it go?)
Hanna Zemira Annabelle
Hanna Zemira Rachael
Hanna Zemira Alys (waves moved-to-Wales flag)
Hanna Zemira Jessica (are the 'a' endings too much?)
Lilja Shoshonna Madeleine
Lilja Shoshonna Rose/Rosabelle/Rosalind/Rosamund. Too much?
Lilja Shoshonna Alyssa
Isak Aharon (so on its own!)
Isak Aharon Elliot
Isak Aharon Nathaniel
Isak Aharon Alexander (the two As?)
Isak Aharon Henry (I think it's cute- might be wrong!)
Oh god. ANOTHER long post. ANOTHER essay. I should really stop people from trying to read it. I could ask MNHQ to put a warning up- 'read at your peril, sleep inducing torture in thread'?