-y (4) Look up -y at Dictionary.com
suffix indicating state, condition, or quality; also activity or the result of it (as in victory, history, etc.), via Anglo-French and Old French é, from Latin -ia, Greek -ia, from PIE *-a-, suffix forming abstract or collective nouns. It is etymologically identical with -ia and the second element in -cy, -ery, -logy, etc.
-y (3) Look up -y at Dictionary.com
suffix in pet proper names (such as Johnny, Kitty), first recorded in Scottish c.1400; according to OED it became frequent in English 15c.-16c. Extension to surnames seems to date from c.1940. Use with common nouns seems to have begun in Scottish with laddie (1546) and become popular in English due to Burns' poems, but the same formation appears to be represented much earlier in baby and puppy.
-y (1) Look up -y at Dictionary.com
noun suffix, in army, city, country, etc., from Old French -e, Latin -atus, -atum, past participle suffix of verbs of the first conjugation.
-y (2) Look up -y at Dictionary.com
adjective suffix, "full of or characterized by," from Old English -ig, from Proto-Germanic *-iga- (source also of Dutch, Danish, German -ig, Gothic -egs), from PIE -(i)ko-, adjectival suffix, cognate with elements in Greek -ikos, Latin -icus (see -ic). Originally added to nouns in Old English; used from 13c. with verbs, and by 15c. even with other adjectives (for example crispy).