Best I could find:
Season 15 https://www.mjsbigblog.com/the-voice-season-15-spoilers-contestant-list-reveal-day.htm
Season 14: https://www.mjsbigblog.com/the-voice-season-14-contestants-reveal-day.htm
Season 13: https://www.mjsbigblog.com/the-voice-season-13-spoilers-reveal-day-contestant-list.htm
Season 11: https://www.mjsbigblog.com/the-voice-11-spoilers-reveal-day-billy-gilman-natasha-bure.htm
Season 10: https://www.mjsbigblog.com/the-voice-10-spoilers-the-top-48-reveal-day.htm
Season 9: https://www.mjsbigblog.com/the-voice-9-spoilers-contestant-reveal-day-name-list.htm
Season 8: https://www.mjsbigblog.com/voice-8-spoilers-contestant-reveal-day-see-names.htm
Season 7: https://www.mjsbigblog.com/the-voice-7-contestant-reveal-day-see-the-names.htm
There's 100% a better post for Season 13 (and a Season 12 post in general) somewhere because I've used them in the past few seasons to seek out old names, but can't find em right now.
Episode 12:
1 - Team Mika: Mia VS Team Bigflo & Oli: Arthur
1 - Team Mika: Mia VS Team Bigflo & Oli: Arthur
1 - Team Mika: Mia VS Team Bigflo & Oli: Arthur