EKENAME

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from eke (n.) an addition, an increase + name; 
'ekename' was the original word for a 'nickname', but by the 15th century the wrong dividing of phonemes in 'an ekename' led eventually to 'a nekename';
the spelling has since changed, but not the meaning;
for more information, see below From: 
Transactions and Proceedings of the American Philological Association
Volume XXII. 1891
IV. English Words which hav Gaind or Lost an Initial Consonant by Attraction
By Charles P. G. Scott
P. 221/222

1303 - Handlyng Synne, Robert Manning of Brunne;
see below From: Roberd of Brunne's Handlying Synne
Edited by Frederick J. Furnivall
Printed for the Roxburghe Club 1862
The Tale of the Knight who had a Vision of the Judgment.
P. 50

From: Corpus Poeticum Boreale
The Poetry of the Old Northern Tongue
From the Earliest Times to the Thirteenth Century
Edited by Gudbrand Vigfusson, and Frederick York Powell
Volume I. Eddic Poetry
Printed 1883
Introduction. xx.