Genesis 17.5
Septuagint

kai ou klhqhsetai eti to onoma sou Abram, all estai to onoma sou Abraam, oti 
patera pollwn eqnwn teqeika se
 

New Testament - Romans 4.17, 18

kaqwV gegraptai oti 
patera pollwn eqnwn teqeika se, katenanti ou episteusen qeou tou zwopoioutoV touV nekrouV kai kalountoV ta mh onta wV onta.  oV par elpida ep elpidi episteusen eiV to genesqai auton patera pollwn eqnwn
kata to eirhmenon:  outwV estai to sperma sou

Septuagint

And they name shall no more be called Abram, but thy name shall be Abraham, for I have made the a father of many nations

New Testament

(as it is written, a father of many nations have I made thee) before him whom he believed, even God, who giveth life to the dead, and calledth the things that are not as though they were.  Who in hope believed against hope, to the end that he might become a father of many nations, according to that which had been spoken, So shall thy seed be 

Masoretic Text

Neither shall thy name any more be called Abram, but thy name shall be Abraham; for the father of a multitude of nations have I made thee

Comments:  The NT, LXX and MT agree.