I write an English essay and it occur two girls who are twins. Do you think the name Grace Amélie Ackerman and Avery Giselle Ackerman would work well together? The girls were from England, English both French roots would have. Amélie and Giselle were of course the second name.
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Sophia and Lydia sounds nice, but is not English. But Kaycee Kate and maybe ?!
Ackerman does not fit and for the first names I would not use a double name in a book. That takes pleasure of reading.
At last names I would still have to work. Ackermann sounds pretty German?