New Living TranslationThis means that Abraham’s physical descendants are not necessarily children of God. Only the children of the promise are considered to be Abraham’s children.
American Standard VersionThat is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed.
Berean Study BibleSo it is not the children of the flesh who are God’s children, but it is the children of the promise who are regarded as offspring.
Douay-Rheims BibleThat is to say, not they that are the children of the flesh, are the children of God; but they, that are the children of the promise, are accounted for the seed.
English Revised VersionThat is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed.
King James BibleThat is, They which are the children of the flesh, these
are not the children of God: but the children of the promise are counted for the seed.
World English BibleThat is, it is not the children of the flesh who are children of God, but the children of the promise are counted as a seed.
Young's Literal Translation that is, the children of the flesh -- these are not children of God; but the children of the promise are reckoned for seed;
Romans 9:8 Additional Translations ... 
