H in "Hermano"

Hello!


I've learned that the H in Spanish mostly has one of these origins:

1. There was already an H in Latin (hombre, haber, etc.)

2. Latin F- (harina, hilo, hembra, etc.)

3. To prevent the comfusion between U and V (hueso, huevo, huérfano, etc.)


What about the word "Hermano"?
The H there doesn't seem to have any of the above mentioned backgrounds.


Thanks for your help!

There are some instances where the Spanish initial 'h' derives from the Latin initial 'g', "hermano" being a prime example (from Latin "germanus", sometimes spelled "iermanus"). In medieval Spanish, "germano" was pronounced with an initial /j/, "yermano". Eventually this /j/ was dropped from common pronunciation and for some reason now lost to us, the initial 'h' was added to its spelling.

Compare (or contrast) with:

gemma > yema
gener > yerno
gypsum > yeso
legenda > leyenda
gelu > yelo > hielo

So basically "Hermano" is some kind of an exception?