From appearances in the books, Houses need not have any living members to still be remembered as a house. Once the house is set up, by either the king, or a high lord all of the family will be part of that house, whether they got land to begin with, or loose the land somewhere in time they will still be a house. So these houses you have listed are most likely minor houses, or great houses that have been replaced. they may or may not still have land somewhere in westeros, and they may have multipul people left in their familys or they could be the last of their respective houses.
Himarm
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