Let me type this from ECHO (light green paperback)
Chap.21, Pg.217 (Bree--modern time at gravestone)
There, next to Ellen's grave, was the tiny square stone for Caitlin Maisri Murray, Jenny and Ian's sixth child, who had lived only a day or so.
<snip>
There was another, she saw, beside it. Another small stone, as for a child. Not quite as weathered, but plainly almost as old. Only two words on it, she thought, and, closing her eyes, ran her fingers slowly over the stone, feeling out the shallow, broken lines. There was an "E" in the first line. A "Y", she thought, in the second. And maybe a "K."
What sort of Highland Name begins with "Y"? she thought, puzzled, There's Mckay, but that's in the wrong order..."
Chap.83, Pg.709 (Jenny taking young Ian to the graves when J&C returned to Lallybroch with Ian)
"Over here," she said softly, and led him to a small square stone set in the earth. He thought it was Caitlin's grave......but then saw that Caitlin's stone lay a few feet away. This one was the same size and shape, but--he squatted by it, and running his fingers over the shadows of its carving, made out the name.
Yeksa'a.
"Mam," he said, and his voice sounded strange to his own ears.
"Is that right, Ian?" she said, a little anxious. "Your da said he wasna quite certain of the spelling of the Indian name. I had the stone carver put both, though, I thought that was right."
"Both?" But his hand had already moved down and found the other name.
Iseabail.
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So, to me, seems like there was another name inscribed later above Yeksa's name. What can you make of this?