This is my middle name, and it's an okay name, as it seems quite ageless in Finland, so it's neither old-fashioned and grandmother-y nor really immature and girly. It's really common as a middle name for girls and women born in the 80s, so it's quite stale in that sense. This could work in English too, but I'm afraid it would sound a bit youthful and tacky in the same way as Joelle, Janelle, etc.
The pronunciation of the name is actually "HUN-ne-le" not "HAHN-e-LE", at least in Finland. I know because I live in Finland and Hannele is my second name.
"Han" is pronounced as "hon" in the English name "Honey", "ne" as "ne" in the English name "Nella", "le" as "le" in the German name "Lena".