Old to modern English dictionary. 2013.
endleofan — num eleven; ordinal endleofta, endleofeða, endlyfta … Old to modern English dictionary
eleventh — late 14c., eleventhe, superseding earlier ellefte (c.1300), enlefte (early 13c.), from O.E. endleofta; see ELEVEN (Cf. eleven) + TH (Cf. th) … Etymology dictionary