The story
From yen + -y (diminutive suffix), probably influenced by penny.
Etymology from Wiktionary, CC BY-SA 4.0.
yenny
Today it means: One yen (unit of Japanese currency); a coin worth one yen. Full definition →
Today it means: One yen (unit of Japanese currency); a coin worth one yen. Full definition →
From yen + -y (diminutive suffix), probably influenced by penny.
Etymology from Wiktionary, CC BY-SA 4.0.