I need help with middles

So, I got this crazy idea while I was walking at the cemetery and I saw the name [name_f]Anna[/name_f] & the last name Liljedahl. Then I started creating a little story, about a young girl, [name_f]Anna[/name_f], who moves from Denmark to X (not sure yet) and is very different, as her looks are quite Scandinavian. She has twin sisters Tenna & [name_f]Thea[/name_f]. [name_m]How[/name_m] would you pronounce these names? She will later have a little sister [name_f]Bella[/name_f]. In Denmark her brother actually lives, she does not know him, as their got separated at birth (he got adopted), but my plan is they will meet at some point in the story and pretty much hate each other. He already have a name - Søren [name_m]Erik[/name_m] Lindhardt.
I am not sure about their middle names yet, but I want to hear what you think, would fit them. I’ll try and make a brief text about them.
Oh, Liljedahl translated (really roughly) is Lillyvalley

[name_f]Anna[/name_f] Liljedahl - 15 year old girl, from Denmark, with light blonde hair and blue eyes. Her nose is a little big, but otherwise she looks pretty. Nice beautiful, but average pretty. She is a bit tall 175 cm and used to be on the Handball team in Denmark. She is the first born and from her mom’s last boyfriend, she never talks to her “real” dad and refer to him as Aage (his name). She is a little shy in the start, but then she gets to be a bubbly person and people loves her.

Tenna & [name_f]Thea[/name_f] Liljedahl - 8 years old twins, with a love for flowers and are actually pretty alike. Tenna, though, has light brown hair, with a tad of frizz, while [name_f]Thea[/name_f] is a natural blonde like her big sister. [name_m]Both[/name_m] have brown eyes after their father & they hardly fights. They could easily be the twins from [name_f]Alice[/name_f] in Wonderland, that close are they. I think a frilly middle would fit them.

[name_f]Bella[/name_f] Liljedahl - ? she is yet to be made, but I thought about calling her [name_f]Bella[/name_f] [name_u]Marian[/name_u]. Any thoughts?

This will be posted on a tumblr account, hopefully. :3

  1. ‘ten-a’ (ten like the number, a like cat) and ‘thee-a’ (th like thought and a like cat)

  2. I don’t think they need middle names. Would you ever use them in the narrative?

Yeah, since it doesn’t really make sense they only have one name, but maybe that’s just me?

My characters probably have middle names but it’s not necessary in the story to ever talk about them. You see?