Yamagami, Lucy

山神ルーシー【以下略】

Yamagami's first name is so lengthy that it is frequently shortened to just "Lucy". Her parents struggled to pick a name and wrote all their ideas on the registration form. This causes her ongoing embarrassment, and she claims she became a civil servant solely to take revenge on the careless bureaucrat who approved her name! She gets angry when people address her by her first name (or any abbreviation).
Her full first name (or at least as much as she bothered listing) is:
Lucy Kimiko Akie Airi Shiori Rinne Yoshiho Ayano Tomika Chitose Sanae Mikiko Ichika.
However, in the Drama CD Crossover with Working!!, Hiroomi Souma stated her name as:
Yamagami Lucy Kimiko Akie Airi Shiori Rinne Yoshiho Chihoko Ayano Fumika Chitose Sanae Mikiko Ichika Yukino Reina Eri Ai Tamiko Chikage Emilia Julia Shizue Erina Chisa Yumeka Natsuki Ranran Rieko Setsuri Chikako Azumi Marina Hideko Chiaki Misaki Naomi Campbell Miku Yuka Masako Sachiko Nana Mutsumi Haruka Yuna Shimako Yukie Rin Sakura Kanna Wakana Hazuki Honami Ruri Mihane Momoka Himari Nozomi Futaba Mayuyu... (still continues)

Spoiler