New Living Translation
My ambition has always been to preach the Good News where the name of Christ has never been heard, rather than where a church has already been started by someone else.

American Standard Version
yea, making it my aim so to preach the gospel, not where Christ was already named, that I might not build upon another man's foundation;

Berean Study Bible
In this way I have aspired to preach the gospel where Christ was not known, so that I would not be building on someone else’s foundation.

Douay-Rheims Bible
And I have so preached this gospel, not where Christ was named, lest I should build upon another man's foundation.

English Revised Version
yea, making it my aim so to preach the gospel, not where Christ was already named, that I might not build upon another man's foundation;

King James Bible
Yea, so have I strived to preach the gospel, not where Christ was named, lest I should build upon another man's foundation:

World English Bible
yes, making it my aim to preach the Good News, not where Christ was already named, that I might not build on another's foundation.

Young's Literal Translation
and so counting it honour to proclaim good news, not where Christ was named -- that upon another's foundation I might not build --

Romans 15:20 Additional Translations ...