Question: What was the real first name of the legendary character on whom the film "Jeremiah Johnson" was partly based?

Context articles: Joe Wizan
Jeremiah Johnson (film)
A.J. Styles and Christopher Daniels
List of legendary kings of Britain
Josh Albee
Mountain Man (novel)
Wild Nothing
Joaquín Martínez
Liver-Eating Johnson
Tera Wray

Joe Wizan (January 7, 1935 – March 21, 2011) was an American film producer and studio executive.
 He was head of 20th Century Fox's motion picture division from 1983 to 1984.
 His credits as a producer or executive producer include "Jeremiah Johnson", "Junior Bonner", "The Last American Hero", "Audrey Rose" , " And Justice for All", Along Came a Spider and Dark Night of the Scarecrow".
 Wizan died on March 21, 2011 at an assisted-living facility in Westlake Village, California.
 He was 76.
Jeremiah Johnson is a 1972 American western film directed by Sydney Pollack and starring Robert Redford as the title character and Will Geer as "Bear Claw" Chris Lapp.
 It is said to have been based partly on the life of the legendary mountain man Liver-Eating Johnson, recounted in Raymond Thorp and Robert Bunker's book "Crow Killer: The Saga of Liver-Eating Johnson" and Vardis Fisher's "Mountain Man".
A.J. Styles and Christopher Daniels were recurring tag team partners in Total Nonstop Action Wrestling (TNA), having won the NWA World Tag Team Championship two times in their regular run as teammates.
 In real life, Styles and Daniels are best friends, and both men have named their sons' middle names after one another - Styles' son, Ajay "Covell" Jones, with Daniels' real last name, and Daniels' son, Joshua "Allen" Covell, with Styles' real first name, from which comes the A. in A.J. Styles.
 This fact was referenced in the storylines that followed the 2009 return of Daniels in TNA.
The following list of legendary kings of Britain derives predominantly from Geoffrey of Monmouth's circa 1136 work "Historia Regum Britanniae" ("the History of the Kings of Britain").
 Geoffrey constructed a largely fictional history for the Britons (ancestors of the Welsh, the Cornish and the Bretons), partly based on the work of earlier medieval historians like Gildas, Nennius and Bede, partly from Welsh genealogies and saints' lives, partly from sources now lost and unidentifiable, and partly from his own imagination (see bibliography).
 Several of his kings are based on genuine historical figures, but appear in unhistorical narratives.
 A number of Middle Welsh versions of Geoffrey's "Historia" exist.
 All post-date Geoffrey's text, but may give us some insight into any native traditions Geoffrey may have drawn on.
Josh Albee (born September 19, 1959) is an American television actor, known for his work as a child actor during the 1970s, and for the role as the young, mute boy Caleb in the feature film, "Jeremiah Johnson".
Mountain Man (1965) is a novel written by Vardis Fisher.
 Set in the mid-1800s United States, it tells the story of Sam Minard, a hunter/trapper living and wandering throughout Montana, Wyoming and Idaho, the book is separated into three parts: Lotus, Kate and Sam.
 The book was adapted for Sydney Pollack's film, "Jeremiah Johnson" (1972).
Wild Nothing is an American indie rock/dream pop band from Blacksburg, Virginia, formed in late 2009 by Jack Tatum.
 During live performances, Tatum is joined by additional musicians, currently Nathan Goodman (guitar), Jeff Haley (bass), Matt Kallman (keyboards, also of Real Estate) and Jeremiah Johnson (drums).
Joaquin Martinez (November 5, 1930 – January 3, 2012) was a Mexican-born American film, theatre and television actor.
 Often appearing in Westerns, Martinez was perhaps best known for starring roles in the 1972 film, "Jeremiah Johnson", in which he played a Crow chief, Paints His Shirt Red, and the 1972 film, "Ulzana's Raid", which was directed by Robert Aldrich and starred Burt Lancaster.
 Martinez was often typecast in roles that stereotyped Latinos, Native Americans, and Mexicans, but he frequently changed and reworked his characters through his acting, sometimes causing tensions with a production's director.
John "Liver-Eating" Johnson born John Jeremiah Johnston (c.1824 – January 21, 1900) was a mountain man of the American Old West.
Tera Wray (born Tera Elizabeth Lents; April 14, 1982 – January 13, 2016) was a pornographic actress, originally from Louisville, Kentucky.
 Her stage name is derived from her real first name, Tera, and her best friend's middle name, Wray.