I'll put out the dif. syls possible in these names and you can go from there.
Itsuki:
i
1. 伊 this
2. 生 life/birth
tsu
1. 津 by the sea
2. 連 through road/ connection
3. 次 (means next, but it's usually a man's name kanji rather than fem.)
4. 都
5. 付
6. 亜
Asia
ki
1. 貴honour/ respect/ worship/ noble position
2. 喜 joy
3. 紀 govern/ writings?
4. 来 come
5. 綺 beautiful
6. 亀 turtle (not common in names)
7. 姫 princess
8. 輝 shine/glitter
9. 磯 beach/shore
10. 基 Christ/foundation
11. 旗 flag
12. 生 life/birth
Izumi:
1. 和泉 peace-spring
2. 泉 spring (water spring)
3. いずみ no meaning... just sounds
Michiko:
michi:
1. 道
2. 通
mi
1. 実
2. 美
3. 見
4. 未
5. 満
chi
1. 智
2. 知
3. 千
ko
子
Namie:
nami
波 wave
na
奈 a kind of plant
那 what
名 name
菜 green plant (veg)
mi
1. 見 (see?)
2. 未 come
3. 美 beautiful
4. 実 seed/fruit
5. 三 3
6. 弥 more and more
e
1. 枝 branch
2. 恵 grace/beauty
3. 江 cove/inlet
4. 絵 picture
5. 愛 love (rare prn., but is possible and occurs in a prefecture's name)