User blog comment:Tails365/Nami's lane partners/@comment-5116121-20121211073936

Not a carry specialist, but I assure you, Sivir and Miss Fortune work with Nami just fine.

Sivir has her passive, which is enhanced by Nami's casts, so she can chase down anyone in her lane. As she relays on staying relatively close to the enemy, Nami's heal will also damage the enemies. Plus her bubble allows Sivir to fully use her Q without any risk of reduction damage.

Miss Fortune has a pretty nice ult synergizing with Namis'. E.g, Nami knocks them up and Fortune is free to burst them down, applied slow wont allow the enemies to move out of the range quickly. Well, if their Flash is wasted, ofc :) Namis' E also enhances her W, which can be just enough to melt some sort of Taric with magic damage.

Hope that helps =)