To me, [name_u]Jordan[/name_u] (prefer this spelling) is a bit mismatched with [name_f]Majken[/name_f]. These are names I think of as the same style as [name_f]Majken[/name_f]:
I actually really love the suggestions you gave. [name_m]How[/name_m] would you pronounce [name_f]Annika[/name_f]? Part of me wants to say UH-NEE-CUH and the other part says [name_f]ANN[/name_f]-I-CUH
[name_f]Margot[/name_f] was also in the running as I felt like [name_f]Majken[/name_f] and [name_f]Margot[/name_f] were a cute sibset, but that somehow got tossed out rather quickly.
I love the name [name_f]Margot[/name_f], especially with [name_f]Majken[/name_f].
Have you considered [name_f]Marina[/name_f], [name_f]Marielle[/name_f], or [name_f]Magritte[/name_f]?
[name_f]Majken[/name_f] & [name_f]Annika[/name_f] are lovely sibset names! (especially if you choose a bird or nature name for a middle such as [name_u]Finch[/name_u] )
[name_f]Majken[/name_f] [name_u]Wren[/name_u] & [name_f]Annika[/name_f] [name_f]Swan[/name_f] or [name_f]Annika[/name_f] [name_f]Lark[/name_f] are nice together