Etymology
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Y

a late-developing letter in English. Called ipsilon in German, upsilon in Greek, the English name is of obscure origin. The sound at the beginning of yard, yes, yield, etc. is from Old English words with initial g- as in got and y- as in yet, which were considered the same sound and often transcribed as Ȝ, known as yogh. The system was altered by French scribes, who brought over the continental use of -g- and from the early 1200s used -y- and sometimes -gh- to replace Ȝ. The French also tended to substitute -y- for -i-, especially before -u-, -n-, or -m-, or at the end of words, to avoid confusion in reading (see U), might also partly explain this tendency in Middle English. As short for YMCA, etc., by 1915.

updated on March 13, 2022

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Definitions of Y from WordNet

y (n.)
a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys;
Synonyms: yttrium / atomic number "
From wordnet.princeton.edu, not affiliated with etymonline.