I am a beginner in Japanese and I've noticed that when two words are compounded into one word the first letter of the second word changes.
hira + kana = hiragana
ko + hayashi = kobayashi
ori + kami = origami
This pattern would imply that the word Katakana should be Katagana.
Any ideas as to why this is ?
NB. I am not referring to Kanji having different readings in Japanese. That is a different issue. I am specifically referring to compound words where the first letter of the second word undergoes a change.