Etymology

-ally

Proto-Germanic *līką ← Proto-Indo-European *leyg-
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The story

  1. Proto-Indo-European*h₂el-
  2. Proto-Indo-European*h₂élisder.?
  3. Proto-Indo-European*leyg-
  4. Proto-Germanic*līką
  5. English today-ally

From Middle English -ally, -alliche, a combination equivalent to -al (adjectival suffix) + -ly (adverbial suffix). The Middle English suffix was originally non-productive, and was from -ly adverbs based on nouns ending an -al. In modern usage the suffix has been reanalyzed and is now treated as a separate, productive suffix.

Etymology from Wiktionary, CC BY-SA 4.0.