TheosisM,
I need to clarify what I had tried to express, but did an incomplete job of it. (I’ve enjoyed thinking about this subject for the past couple of days, and re-reading some of the passages and looking at the Greek to English translations. So–thanks for questioning and thus stimulating the study.)
When I had referred to “change from the original text”, I was meaning the change to use the word “Elijah” rather than the Greek name (or title) “Elias” in the translations. I had viewed the use of the Greek “Elias” in the New Testament translations as a way of expressing that the translators of the DR and the KJV wanted to allow the reader to make their own judgment about whether the “Elijah” described in 1 Kings-2 Kings and mentioned in Malachi should be the single person whom the reader would have come to mind when they would read the New Testament references that include the name “Elias”, particularly because of the expression the “spirit and power” of Elijah resting upon Elisha, and later upon John the Baptist (see 2 Kings 2:14-15 and Luke 1:17).
It appears the later translators made an assumption and wanted to associate the Elias references specifically to the prophet Elijah of the Old Testament–which would be a logical assumption for their purposes and based on their understanding. But it appears to me that the verses associated with the name Elias in the New Testament, and the verses in Isaiah 40:1-5 and 9-11 and Malachi 4:5-6, are dual fulfillment prophecies or texts that deal with both the messenger role of John the Baptist and the restorer role of Elijah the prophet, and with both the first coming of the Messiah and His glorious and triumphant Second Coming.
I personally wish that Catholics and Protestants, if they do indeed believe that John the Baptist fulfilled the prophecy of Malachi about the coming of Elijah the prophet, would earnestly go about fulfilling the words that say “turn the heart of the fathers to the children, and the heart of the children to their fathers,” which to me means that fathers would take their role as head of their home and provider for their family very seriously with no excuses, thus alleviating a burden upon many mothers who find themselves in a provider role for their family; also, that having children would be viewed as the most sacred of all trusts God gives to humankind, and the highest calling a man or woman can have from God; finally, that the heart of the children would truly turn to their fathers (meaning their ancestors) and wonder about their salvation, desire their salvation, and yearn for their salvation through the plan of salvation given by the Lord, Jesus Christ to all of humankind.