Howling:Water References

It has come to my attention through re-watching the new series of Doctor Who that there are a number of references, particularly in the names of companions, to bodies of water. They are as follows;

River Song

Jackson Lake

Adelaide Brooke

Amy Pond

What these names mean is, as of yet, a mystery to me, though the connection to "The Waters of Mars" may be relevant, as two people who were supposed to die on Mars no longer did.