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Random google: https://energyeducation.ca/encyclopedia/Kilogram
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Originally the gram was going to be the base unit, but due to historical reasons regarding an artifact used to define the kilogram, the kilogram was chosen as the SI base unit for mass.
"They made a decision, cast the decision in platinum-iridium and then they were stuck with it.
Greenbank-
It's defined in terms of the Planck constant now, not the physical kilo in Paris, so not stuck with kg technically anymore.
Incidentally regarding MM, it's no more consistent than anything else, as a billion isn't MMM in accounting it's Bn. It's just a convention and one no one else uses it. Everyone understands k, m, b or bn, t or tn or similar.
neu
It always hurt me a little that the si unit for mass is kg. Why not call it g?