Does anyone know why Toronto are called the Maple Leafs instead of the Maple Leaves?

Whilst it doesn't follow the usual English of changing the f to ves to form the plural, the Miriam Webster Online Dictionary deems leafs as an acceptable form of plural for leaf.

Inflected Form(s): plural leaves also leafs

https://www.merriam-webster.com/dictionary/leaf

Conn Smythe, who bought the Toronto St. Patrick's Hockey Club, changed the name to the Toronto Maple Leafs. He just liked the way it sounded. It all happened on St. Valentine's Day, 1927.

The official name of the Toronto Maple Leafs is "The Toronto Maple Leaf Hockey Club". In this case Leaf is a proper noun. When making a proper noun plural it is incorrect to change the spelling of the singular name, which is why it is spelled Leafs and not Leaves.

For example: The noun "baby" is made plural by dropping the 'y' and adding an 'ies' - babies, but if there was a family surnamed Baby, they would be called the Babys.

Because they were named after the Maple Leaf regiment of the Canadian Army. Since Maple Leaf is a proper noun, the correct plural is Maple Leafs, not Maple Leaves.

https://green-infos.com/library/lecture/read/26679-where-is-david-clarkson-now

The somewhat peculiar spelling of the word "Leafs" vs. "Leaves" is in actuality grammatically allowable, just as "dwarfs" is an alternative to the spelling "dwarves".

https://en.wikipedia.org/wiki/Maple_Leafs#Early_years_.281917-27.29