meaning of name

hello everybody who is looking this page

i am looking for three boys' names
one of names should mean some things like this:
1.cruel, kill, no mercy, born as a killer, dark,
2.wise, clean mind, good at planning
3.timid

then i am looking for three girls' names
they mean some things like this:
1.careful
2.love by the water, sea girl (i do not want the name of god of water)
3.arrogance, selfish

i have been looking on the internet for some time and i still cannot find any
please help me find them
and please list the meaning near the name
thanks so much

the reason i need these names is that i am planning to write a story
and having those name will help a lot
again thank you so much for willing to help me