I think
Jamie is very sweet on a girl! I wouldn't use it on a boy, personally.
Jamie Katherine is very pretty - I like the idea of using a longer, very feminine name with it, to kind of balance out the unisex first name. Some other suggestions:
Jamie AlexandraJamie ElisabethJamie OliviaJamie AuroraJamie JasmineJamie NatalieJamie NatashaJamie AmityJamie GloriaJamie SeraphinaJamie CassandraJamie CrystalJamie SaffronJamie Miranda
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