According to Wikipedia, "Okinawan name", speaking about the warabi-naa 童名, the primary personal names of Ryūkyū:
A set of warabi-naa appeared in the very beginning of recorded history and has not been changed since then. The number of warabi-naa pooled in society was extremely small. It was not uncommon for a warabi-naa to be shared by more than one person in a household.
So, the set is small and defined. Where can I find that set? The Japanese version of the article provides examples of warabi-naa, without attempt at exhausting.