Being a foreigner, it’s really hard to remember “koichi” for kou, since I’ve never heard this name before.
I finally remembered, by saying “co-founder” instead. Kou-founder. Or even first cofounder co-ichi.
Thought this might be helpful for others… and I thought that typing up this comment would help me remember that koichi means co-founder #1 (ichi) and is pronounced kou