It is the name for the month of August in the Irish language. There is also an Irish band called Lunasa. Lughnasadh, which is pronounced the same way, is also an ancient Gaelic holiday associated with the 1st of August.
Lunasa Prismriver is able to play a violin without physically touching it. Her sisters can play keyboard and trumpet in the same kind of way.
Taken from touhou wiki Alice Margatroid Aya Shameimaru Byakuren Hijiri Chen Chiyuri Kitashirakawa Cirno Daiyousei Eirin Yagokoro Elis Ellen Elly Flandre Scarlet Fujiwara no Mokou Gengetsu Genji Hatate Himekaidou Hieda no Akyu Hina Kagiyama Hong Meiling Hourai Ichirin Kumoi Iku Nagae Kaguya Houraisan Kana Anaberal Kanako Yasaka Kasen Ibara Keine Kamishirasawa Kikuri Kisume Koakuma Kogasa Tatara Koishi Komeiji Komachi Onozuka Konngara Kotohime Kurumi Kyouko Kasodani Layla Prismriver Letty Whiterock Lily White Louise Luna Child Lunasa Prismriver Lyrica Prismriver Mai Mamizou Futatsuiwa Maribel Han Marisa Kirisame Medicine Melancholy Meira Merlin Prismriver Mima Minamitsu Murasa Minoriko Aki Momiji Inubashiri Mononobe no Futo Mugetsu Myouren Hijiri Mystia Lorelei Nitori Kawashiro Nue Houjuu Orange Parsee Mizuhashi Patchouli Knowledge Prismriver sisters Ran Yakumo Reimu Hakurei Reisen Reisen Udongein Inaba Remilia Scarlet Renko Usami Rika Rikako Asakura Rin Kaenbyou Rin Satsuki Rinnosuke Morichika Rumia Ruukoto Sakuya Izayoi Sanae Kochiya Sara Sariel Satori Komeiji Seiga Kaku Shanghai Shikieiki Yamaxanadu Shingyoku Shinki Shizuha Aki Shou Toramaru Soga no Tojiko Sokrates Some Mid bosses Star Sapphire Suika Ibuki Sunny Milk Suwako Moriya Tenshi Hinanawi Tewi Inaba Three Mischievous Fairies Tokiko Toyosatomimi no Miko Unnamed Giant Catfish Unzan Utsuho 'Okuu' Reiuji Watatsuki no Toyohime Watatsuki no Yorihime Wriggle Nightbug Yamame Kurodani Yoshika Miyako Youki Konpaku Youmu Konpaku Yukari Yakumo Yuki Yumeko Yumemi Okazaki YuugenMagan Yuugi Hoshiguma Yuuka Kazami Yuyuko Saigyouji so far..