Many of our ancestors could not write, or could not write well. The law still needed their consent, so they "made their mark": usually a cross, sometimes an initial or a little symbol. Someone else (the clerk, the merchant, a witness) wrote the name around it, with "his" or "her" above the mark and "mark" below. Read it as one phrase: John, his mark, Russell.
Real signatures have their own puzzles: big capital loops, flourishes under the name, and abbreviated first names like Jno. And many signatures you find are not originals at all. Wills, deeds and marriage bonds were copied into record books by a county clerk, who copied the marks too. A cross in a will book shows that the original was signed by mark. It is not your ancestor's own pen stroke, and it can even be a clerk's error.











