This is the 4171st most frequent Japanese word.
一幸
"一幸" (Ikko): "One happiness" or "a single blessing."
In this context, '一幸' is used metaphorically to depict a significant moment of happiness or fortune.
彼の成功は彼にとっての一幸でした。
His success was a great fortune for him.
In this sentence, '一幸' is used as a proper noun, specifically a person's name.
彼の名前は一幸です。
His name is Kazuyuki.
Here, '一幸' represents a happy or fortunate event, emphasizing the singularity of the occurrence.