Look, friends, it's really simple if you think about the historical development of alphabets generally.
The first writing systems were not alphabetic. They used simpled pictures to represent entire words. Such "pictograms" were used in the hieroglyphic systems as that used in ancient Egypt, ancient Meso-America and even in China of today. Thus, a picture of a hand means "hand" and a picture of a head means "head," etc.
It is a mistake to impute this to alphabetic systems.
In alphabetic systems, the shape of letters is essentially arbitrary. It doesn't matter that the letter yod looks like י today. The shape of the letter can (and did) change over time. What is important is that the letter represent a sound or a set of sounds in combination with other letters.
The names of the letters in Hebrew were chosen from Phoenician (the language of those who developed this writing system). At some point, the Phoenicians set out to discover what sounds existed in their language and to represent each sound with a different picto-drawing. They then chose words in their language that began with each sound and arbitrarily assigned each letter a word that begins with the sound. The letter was never intended to be interpreted into the meaning of the word. It was simply a designation of the sound by name.
The Hebrews adopted the letters of the Phoenicians and applied some changes to the names of the letters according to the sounds of the Hebrew language. Never at any point did they stop and say "well, this word has a yod, so it should have the meaning of 'hand' in it. This one has a heh, so it should have the meaning of 'blowhole' somewhere in it." Etc.
It NEVER worked that way, and it should not be interpreted to work that way today. It's wrong. It's a huge deception on the part of those who think this way. It's sad that they promote this nonsense.