Thinks that among the suggested candidates for authorship of Hebrews. the 2 I encountered most often in commentaries and bible references books were Barnabus and ApollosIn teaching NT Introduction to seminary students, we did a study on possible authorship of Hebrews. Pre-computer, but probably in a file and I will search for it. Had some good possibilities (Barnabas by far the leading candidate). All agreed on one thing: it couldn't be Paul.
Sadly, saved421 has again railed against the BB and our anti-kjvonly sect and left. But others may be interested in the topic of authorship.