how would you interpret this?

[KATM]

I don't know that "multiple surname lines" is a common term, but when I saw it in the context of jimbirk's post above, my first interpretation was that with multiple segments, some segments might come from different ancestors on the maternal side (those who could contribute an X-chromosome segment). As jimbirk posted, since the father doesn't match on the X-chromosome, the person who matches Kohlehydrat must be from Kohlehydrat's maternal side (Kohlehydrat inherited no X segments from her father that match the person in question). The chart below shows X-chromosome inheritance for a female, but in Kohlehydrat's case, we can ignore the contributing ancestor's on her paternal side.

X_female_inheritance.jpg
You can see that there are several different lines, and thus surnames, from which the X segments might have been inherited. The chart goes up from Kohlehydrat (pink circle at bottom) through certain of ancestors, up to certain of her 2nd great-grandparents. She needs to replace the blue squares and pink circles on her maternal side with the appropriate surnames, and concentrate on those surnames to see if this female match has them in her tree.

I had a similar situation with a match at 23andMe a few years ago, who matched on only one autosomal segment (5.88 cM), but matched on the X chromosome on two segments, 20.71 cM and 47.34 cM. I was able to correspond with her a bit before she lost interest, but the shared segments were from my maternal grandfather for me (via his mother), and apparently a maternal ancestor of her father (they had the same country of origin, and our other parents' and grandparents' ancestries were from distinctly different countries). Unfortunately, neither of us had enough information for the earlier generations in those lines to pin down the likely common ancestor.

Kohlehydrat's mother inherited two X chromosomes, one from her father, the other from her mother, and it is possible that Kohlehydrat inherited different X segments from those maternal grandparents, thus different surname lines.

[raspchide]

Multiple surname lines mean surnames that sound like. For example, Vines then Dines. That's how I define it but, not sure if that is the one being referred to.

Oh, so that what it means. I though having two surnames then connected with a hyphen.

[Givert]

Multiple surname lines mean surnames that sound like. For example, Vines then Dines. That's how I define it but, not sure if that is the one being referred to.

[Kohlehydrat]

oh, i am sorry, i am female. my mother is deceased, no living relatives, no dna info available from that side. thank you so much for replying. what do you mean by "multiple surname lines"?

[jimbirk]

You did not specify your gender.

With the information specified the matching X DNA can only be from your mother.

A 44 cM X match could be from 3 to 8 generations back and with 5 segments is probably on multiple surname lines.

The 10 cM match is small enough that it may not be a valid IBD match.

[Kohlehydrat]

a woman is a match with my father and with myself. below are the details, she is an X-match with me but not my father. the amount of X-cMs shared with me would indicate that the match is valid? how would she also be a (non X) match with my father? way, back, i suppose but then where are the 44 with suddenly appearing from?

Match with my Father
Shared DNA: 10 cM
Longest Block: 10 cM
X Match: No Match

Same person match with me
Shared DNA: 10 cM
Longest Block: 10 cM
X Match: 44 cM
X-Match blocklengths are:
8.82, 7.50, 12.78, 6.69, 7.85