There's no record of Jesus uttering the divine name in any Greek manuscript. Jesus always referred to God as "Father" and "God". When he quoted OT passages that use the divine name in Hebrew, he - and the NT writers - quoted from the Greek Septuagint and the Greek Septuagint of the day used "Kyrios" ("Lord") in place of the divine name. This is why the divine name is totally absent from the NT. It was never in there to begin with because common use of the divine name had ceased by the first century and the people were using the Greek Septuagint which substitutes "Lord" in place of the divine name.
John 17:26 isn't a reference to declaring the appellation "Jehovah"/"Yahweh"/The tetragrammaton. Rather, it is a reference to declaring God's character or reputation. Jesus made God's character or reputation known to the people through his word and deed. This is what it meant by him making God's name known. There are many references to "name" in the NT that refer, not to God's appellation, but to his character or reputation. Such as the phrase - "a people for his name" which means a people whose way of life is befitting of the character of God; a people who uphold God's reputation instead of bringing reproach on him; a people who are holy just as God is holy; etc.