Yashar

In Bible versions:

Jashar: AVS NIV NRSV NASB TEV
Scroll of the Upright One: NET
Yashar: NET

a book of songs with short historical introductions (IBD)

Hebrew

Strongs #03477: rvy yashar

1) straight, upright, correct, right
1a) straight, level
1b) right, pleasing, correct
1c) straightforward, just, upright, fitting, proper
1d) uprightness, righteous, upright
1e) that which is upright (subst)

3477 yashar yaw-shawr'

from 3474; straight (literally or figuratively): KJV -- convenient, equity, Jasher, just, meet(-est), + pleased well right(-eous), straight, (most) upright(-ly, -ness).
see HEBREW for 03474