I am not surprised at the similarities, there are alot of names for using a stick for martial arts but only a limited number of ways to use it.
Africa: Dambe (Hausa) · Istunka (Somali) · Juego del Palo (Canarian) · Nguni (South Africa) · Nuba · Surma
Asia: Eskrima (Filipino) · (Bojutsu (Japanese, Okinawan) · Dambong-Veng (Cambodia) · Gun (Chinese) · Hanbojutsu (Japanese) · Jojutsu (Japanese) · Lathi khela (Bangladeshi) · Kalaripayat (Keralan) · Silambam (Tamil) · Tanjojutsu (Japanese)
Americas: Juego del Garrote (Venezuela) · Bajan (Barbados) · Calinda (Trinidad)
Europe: Bata (Irish) · Bāton (French) · La canne (French) · Jogo do Pau (Portuguese) · Quarterstaff (English) · Singlestick (British)
and so on.
Every country in the world have stick weapons. Not just the above mentioned. Heck you can find a stick anywhere...on the beach...on the street...and so on... But are you aware that our Maori & Japanese languages and culture are similar? A classic example is we take our shoes off when entering the Wharenui, as do the Japanese.