There seems to be a lot of old live oaks around here; maybe because they're protected so construction takes place around them. When first married, used to live near the seven sisters tree. Wasn't impressed by it because it looked like a clump of trees that had grown together, rather than a single tree. Some of them in there area here look like that too, so not really sure if that's what they sometimes do, if they're really one tree or were originally multiple trees. Mine is obviously one tree.
SO where do you live. Hell, half the time I talk about live oaks (one of the most majestic and massive trees on the planet) and everyone just makes the joke about, since there are so many live oaks show me the dead oaks, bullshit. Most people do not even know what a live oak is.
... and yet, you brought it up. I salute you.
As far as the clumps of trees thing, many are. Remember how they propagate. They drop acorns and the squirrels find them and bury them in the ground for later, then forget about where they were buried and in two years or so the double dormant acorns sprout.
Many acorns in close proximity will develop into a single, very majestic tree cluster sometimes. Seen it a lot in central Texas.