Here is a list of terms related to an average person
Filan/Filone Fisteku
Havush Politanka
Juan Pérez, Fulano (de Tal) (likely from Arabic Fulan), Mengano, Menganito, Zultano or Sutano, Perengano, N.N., Doña Rosa
John Smith, Joe Bloggs, Joe Blow, Fred Bloggs, Fred Nurk/s, Jane Smith, Jane Bloggs
Filankes Filankesov
John Brown,
Iñaki, Patxi
Jan met de Pet, Jan Janssen, Piet Pietersen, Jos Joskens, Jan Modaal, Jef Klak
Marko Marković, Petar Petrović, Sima Simić, Niko Neznanović, Kokalo Ibrahim
Fulano (de Tal), Beltrano, Sicrano, João da Silva, Zé da Silva, Zé Ninguém, Zé Ruela, Zé das Couves, João das Couves
Иван Иванов (Ivan Ivanov), лицето Х (Person X)
Bud or Buddy is also commonly used as a placeholder (e.g. "Buddy over there has a sweet truck" and "Out for a rip are you, Bud?")
Juan Pérez, Fulano de Tal, Perico de los Palotes, Sra. Juanita, N.N. (Ningún Nombre, i.e., No Name, a nobody).
无名氏(Wumingshi, means person with unknown name), 佚名(Yiming, means unknown author), 某某(Moumou, means somebody, sometimes used after a person's family name)
小明(Xiao Ming, boy), 小军(Xiao Jun, boy), 小红(Xiao Hong, girl), 小华(Xiao Hua, girl), 李华(Li Hua, used in English writing test in China), 志明(Zhiming, male, used in Taiwan), 春嬌(Chunjiao, female, used in Taiwan)
张三 (Zhang San, means Zhang number three), 李四 (Li Si, means Li number four), 王五 (Wang Wu, means Wang number five), 赵六 (Zhao Liu, means Zhao number six), the above names are for multiple people. 甲, 乙, 丙, 丁 (Jia, Yi, Bing, Ding,the first four characters of Tiangan, equivalent to A, B, C, D in English) are also for multiple people.
Juan Pérez, Fulano de Tal, Pepito Pérez
Juan Pérez, Fulano de Tal, Sutano, Mengano, Perencejo, Juan Vainas, Perico de los Palotes
Ivan Horvat, Pero Perić
Fulano, Mengano, Ciclano, Esperancejo (female versions: Fulana, Mengana, Ciclana, Esperanceja.) Optional family name: de Tal ("of something or other")