nam-cúþ
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
nam-cúþ
Add:I. of persons Wæs sum ríce cyning, namcúð on worulde, Asuerus geháten. Hml. A. 92, 2. Sum wer wæs namcúð and hlísful þurh his drohtnunga, 195, 15. His mǽre cynn wzs swíþe namcúð eallum folce, Hml. S. 23, 630. II. of things Asteriscus ys namcúð tácen, Angl. viii. 333, 39. [v. N. E. D. namecouth.]
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

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A Combined List of Abbreviations.