The best replacement for millie is milly.

The best alternatives to millie are rated as following:
★★★★★  milly
★★★  rosie
★★  caggie
★  silverstream
★  afi
★  jemima
★  amelia

Your alternative for millie is not listed? Suggest!
Speaking about millie, one probably shouldn't forget about professor green.

Other search terms related to millie and their ratings are:
★★★★★ professor green
You have in mind a companion for millie and it is not yet here? Propose!



Google Trends

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millie
milly
rosie