It's simple enough to Google "etymology eleven" to see that it is a base 10 word.
Modern proponents of a dozenal system seem to prefer the words "el" and "doz" for eleven and twelve. I would totally be in for changing, but realistically it'll never happen.
Numberphile on the dozenal system: https://youtu.be/U6xJfP7-HCc
Re:Roman Finger Counting
by occamrazor on Friday May 15, 2020 @07:47AM
(#23191050)
“Twelve” is suspiciously similar to “two” however, which makes me wonder about its origin.
Ten, eleven and twelve are unique names and probably have their entymology derived from a base-12 numbering system once primarily used in Anglo-speaking countries.