'Raise Up the Name of the Dead' in the Bible

Then said Boaz, What day thou takest over the land from the hand of Naomi, also, of Ruth the Moabitess, wife of the dead, dost thou take it , to raise up the name of the dead upon his inheritance.

Moreover, Ruth the Moabitess, wife of Mahlon, have I taken over, to be my wife, to raise up the name of the dead upon his inheritance, that the name of the dead be not cut off - from among his brethren, and from the gate of his dwelling- place, - Witnesses, are ye to-day!