So, reading the newest post–What Are Your [name_m]Favorite[/name_m] Unusable Names–I’ve noticed among the comments several of you listed a few names that can be made useable. [name_m]Just[/name_m] heavily utilize the convenience of nicknames! ;D
Hespara=[name_f]Essie[/name_f]
[name_f]Electra[/name_f]=[name_f]Ella[/name_f]/[name_f]Ellie[/name_f];
[name_f]Calliope[/name_f]–it’s such a beautiful name! Use the more recognized nn [name_f]Callie[/name_f] at large, so she won’t have much the risk of–whatever you’re afraid of! =)
as for [name_m]Thelonius[/name_m]=I only have one for you…[name_u]Lonnie[/name_u]
Entangler: I don’t know how ‘Un-American’ you feel you are, but nicknames could work for you, too! For [name_f]Alaska[/name_f], try [name_u]Allie[/name_u]. [name_u]Indiana[/name_u], unfortunately, is a bit more obvious. You could use it as a middle name, and very few people would know, but other than that, I’m not sure. [name_f]Primrose[/name_f], I don’t think, is much to worry about–you can give her a middle name that starts with a usable initial(i.e., J…), P.J. Or, use [name_f]Rose[/name_f]/[name_f]Rosie[/name_f]/[name_f]Rosa[/name_f] for a nn. [name_f]Freya[/name_f] could also be utilized as a middle name. 
As for you, thatkathryngirl, I [name_f]LOVE[/name_f] Irish names, and I’m nowhere’s near motherhood, and am American. Here’s a few I think you could pull off:
[name_m]Ewan[/name_m]; [name_m]Orrin[/name_m]; Aven(similar to [name_u]Haven[/name_u], which is popular these days); [name_f]Ashling[/name_f]; [name_f]Chevonne[/name_f] (<3); Cayleen; Erin… Find more at babynames.com…
Indiefendi: Lux would make for a great middle name; If you use Nirvana, no one has to know–call her Anna, or maybe Van, although that’s a bit of a push; Like Tennessee? Nessy makes an adorable nickname, although you may have questions as to whether you’ve ever been to Loch Ness ;D.
litysmama: Lilith, I don’t think as far as I’m aware of it, that Lilith has that bad a meaning: Of the Night, am I correct? As for Thessalonica and Corinth, suitable nicknames are actually trending at the moment: Tess, Allie, Nikki, Essie, for Thessalonica, and Cory/Cora for Corinth.
Allissonhyatt, no comment, except That’s funny!
alexa400: for Bellatrix(which is a beautiful name!) there are possible nicknames that wouldn’t seem to lead back to the Harry Potter figure: Bella, Trixie, Ella… The first name you listed I can’t even pronounce(although I’m sure anybody willing could learn), and Eglantine isn’t as impossible as you think. Now, although I’ve never met somebody bearing that name, I think these nn would get less flak: Tina, or take out the g and use Ella.
arunciblespoon: I get your drift on the first two you listed. But Plum could make for both an adorable middle name and a nickname. As for Ignatius–Nate could work pretty well, yes?
ottilie: hint: Use Cassie, or give her a middle name that starts w/ J or some sort–C.J. Also, use it for a middle name.
Abby: You could always instead pronounce it C-R-e, like a car, you know?
Hey, dramagirl19. You’ve got some good picks there. If I could make a suggestion–I have no idea what reference that was to Mackynzie, so I can’t help you there. Like I told alexa400, Bellatrix can work with some less than clever nn…see above paragraphs. As for Jax, middle name reservations–it could totally work. And with Owen: find similar names: I’ve mentioned Orrin; there’s also Roan, Ronan, Boden/Bohdan, and some others.
iamamiam: Hypatia goes for patty or hippa(similar to Pippa);
Lo, I get what you said about the others, but Caroline can be made usable–nn, Ollie. Or use the middle initial w/ the first, as in C.J., C.K., etc.
abbijane, Hyacinth–cinthia.
Mdonak1: I like Oberon, too. Use Ron., or O.J. So? Use Percy/Perse for a nickname for Persephone.
I know it’s a long shot, but Pertinax–Perry, or Tina.
inonherfingers: Columbine, call her Collie; Allegra: Allie; Elodie, Ella/Ellie; Story, I’m sorry to say, is an amazing name, so I can offer two suggestions: middle name, or use it on a pet. Alleluia, Allie, or Lu. for Bonaventure, which is an awesome name, you’d have to be brave to use it for first, although in desperation you could use Aven for a nickname; also, as a nickname it wouldn’t be that horrible. Lysander is easy–Andy, Sandy…For Hawthorne, I know what you mean and can’t find a suitable nn, but Heathcliff you could use Cliff. I LOVE Justice, it’s probably top on my name list, and I think it doesn’t sound at all pretentious. It’s just beautiful.
oboeplayer1, Reverie is a gorgeous name, and Vera isn’t bad to use for nn.
Also, if you absolutely love a name but are afraid for you kid if you gift it to them, or your husband won’t allow it, use it for a pet. Simple as that.