Short answers, pulled from the story.
The word bebop first appeared in a 1928 recording by McKinney's Cotton Pickers titled Four or Five Times. Nonsense syllables like bebop and rebop were used in scat singing long before the music style existed.
Thelonious Monk claimed his composition Bip Bop, later known as 52nd Street Theme, originated the name. Dizzy Gillespie stated that audiences coined the phrase after hearing him scat unnamed compositions.
Coleman Hawkins led a session including Dizzy Gillespie and Don Byas on the 16th of February 1944. That date marked the first formal recording of bebop titled Woody'n You.
Charlie Parker experienced a transcendent moment playing Cherokee at Clark Monroe's Uptown House in early 1942. He found he could use higher intervals of a chord as melody lines backed by related changes.
Miles Davis joined the crew of innovators in 1944 as a young trumpet player attending Juilliard. He appeared as a sideman on Charlie Parker's historic recording session on the 26th of November 1945 for Savoy label.