Sienna - I like it. Everyone says it's popular but I've only ever met one and I've been a teacher for 12 years.
Summer - really like it. But I would worry that my child wouldn't have a very summer personality iyswim.
Amalie - quite like it. Never seen it spelled with an a in the middle
Thalia - would you say it 'Tar-lee-a' or 'Thay-lee-a'. I really like the first but not the second at all - it sounds like failure.
Lucia - it's ok. Probably my least favourite of your list.
Other ideas for modern names:
Amber, Aubrey, Avery, Alyssa, Bailey, Cassidy, Cherry, Devon, Dulcie, Elodie, Eden, Fallon, Genesis, Halle, Hayley, Hadley, Honey, India, Jordan, Jade, Jasmine, Kayla, Kendall, Leonie, Larissa