To begin with, it's worth pointing out that the novelisation of the Revenge of the Sith film makes it explicitly clear that Anakin didn't own Artoo, he was merely looking after him for Padmé:
Padme’s life back when she had been Queen of Naboo, not to mention
helping the nine-year-old Anakin destroy the Trade Federation’s Droid
Control Ship, breaking the blockade and saving the planet. The Royal
Engineers of Naboo’s aftermarket wizardry made their modified R-units
the most sought after in the galaxy; he’d tried to protest, but she
had silenced him with a soft finger against his lips and a gentle
smile and a whisper of “After all what does a politician need with an
astromech?” “But I’m a Jedi-“
“That’s why I’m not giving him to you,” she’d said with a smile. “I’m
asking you to look after him. He’s not really a gift. He’s a friend.”
That all being said, the Clone Wars Character Encyclopedia specifically refers to R7-A7 as "Ahsoka's Astromech" and makes reference to it being part of a "group of Jedi Droids".
It also says that Plo Koon is particularly attached to his Astromech, refusing to send it for the customary 'memory wipes' for fear of damaging its unique personality.
Beyond this, there are no canon references to Jedi owning droids.