According to the 1900 Federal census, Luke was born in August 1867. He is the son of George and Sarah Green.
The censuses record his clan name as MonMonChaNaGeKaRaWaKah. The end of the name, Kah, represents a definite article suffix used in personal names. The front part of the name is mąmąče, "a ball-headed warclub, connected with the Thunderbirds." The next syllable, -na, may be the definite article. GeKaRa may be for jikere, "to start, to begin." If Wa represents we, "to go around, travel, the name would mean, "He Begins to Go About with the Ballheaded Warclub. If, however, Wa stands for wą̄, "to shout, to whoop, to call, to call for someone", the name would mean, "He Calls to Begin Going About with the Ballheaded Warclub." This looks like a Thunderbird Clan name, but clearly the Green family belongs to the lower moiety, so it is more likely that it recalls the idea that their ancestor Black Otter was supposed to be a reincarnated Thunderbird.
The Luke Green buried in Neillsville is almost certainly this Luke Green, despite the fact that his date of birth is given as 1859 rather than 1867. There is a well known penchant in this culture and the old pioneer culture, for old people to exaggerate their age. (Find a Grave)
Find a Grave, database and images (accessed 20 June 2020), memorial page for Luke Green (1859–18 Oct 1941), Find a Grave Memorial no. 121742022, citing Dewey Mike Cemetery, Neillsville, Clark County, Wisconsin, USA ; Maintained by Bob Ottinger (contributor 47263661) .