Each edition of The Journal has an index at the very end. These PDF files are not searchable, however, using the index should quickly and easily tell you if the surname you are researching is listed anywhere in that particular volume. Remember that the index refers to the page number within The Journal, not the page number within the file (they do not coincide).
These files vary in size. As the years went by, and more pages were added, they got larger. The earlier ones (up to 1997) are 12MB or less. The newer ones, from 2012 on, are 20MB to 60MB, so please be patient with opening those.