Steve Ray has a list of more than 35 loaded Questions for "Bible Christians" (quotation marks his)(link to the whole list). I originally planned to respond to just 35 of them, but the series seems to have been of interest, so in this extension, I'm responding to three more numbered questions in his list, plus fourteen "bonus questions" that take the form "Where does the Bible say ... ." I'm trying to provide the answers in the same common format as the original series, for easy reference. This is number 11/17.
Where does the Bible . . .
. . . inform us of the names of the authors of the Gospel of Matthew, Mark, Luke, or John?
1) The text of Matthew's Gospel doesn't tell us the name or identity of the author. All of the texts of the gospel use the title "according to Matthew" but we aren't necessarily insistent that the title has to be right.
2) The same is true of Mark's Gospel.
3) Luke's gospel doesn't specify that the name of the author is Luke, although the same title note as with Mark and Matthew is also true of Luke. We can tell from the introduction of Luke and of Acts that the two were written by the same author:
Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us, even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word; it seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus, that thou mightest know the certainty of those things, wherein thou hast been instructed.
The former treatise have I made, O Theophilus, of all that Jesus began both to do and teach, until the day in which he was taken up, after that he through the Holy Ghost had given commandments unto the apostles whom he had chosen: to whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God: and, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me.
We also learn from Acts that the author of the book was one of Paul's companions, at least from Acts 20:
Act 20:6 And we sailed away from Philippi after the days of unleavened bread, and came unto them to Troas in five days; where we abode seven days.
And continuing to Acts 28:
Where we found brethren, and were desired to tarry with them seven days: and so we went toward Rome. And from thence, when the brethren heard of us, they came to meet us as far as Appii forum, and The three taverns: whom when Paul saw, he thanked God, and took courage.
4) The identity of the author of John's gospel has already been discussed in the previous segment.
We have additional historical evidence that the gospels should be attributed to their respective authors. Nevertheless, nothing important about what believe hangs on whether the names of the titles of the books were the actual names of Jesus' disciples that wrote the books.