Probably from pashach; liberation; Pashchur, the name of four Israelites -- Pashur.
see HEBREW pashach
H6583. Pashchur
מַּשְׁחוּר proper name, masculine Πασχωρ, Φα(δα)σσουρ etc.:
1 Jeremiah 20:1-2, 3 (twice in verse); 20:6.
2 Jeremiah 21:1; 38:1b Nehemiah 11:12, compare 1 Chronicles 9:12.
4 father of one Gedaliah Jeremiah 38:1a.
5 head of post-exile family Ezra 2:38 = Nehemiah 7:14; Ezra 10:22. compare MeyEntstehung 169 f.