There is absolutely nothing wrong with a line of type ending in a single-letter word like "I" or "a". Where in the world did you pick that up? I don't think you found it in the Chicago Manual of Style, which has been the editor's bible for more than a hundred years (108 years, to be exact).
Nor will you (I don't think) find any rule against hyphenating a surname. Indeed, my 14th edition gives a specific example of just such a break: Frederick L. An - / derson (page 207). To be sure, the CMOS recommends against breaking a proper name "if there is any way to avoid it," before going on to show how it ought to be done if necessary.
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