Who were albert Einstein's friends?

Answer 1

Some of his friends were Max Talmud and his sister Maja Einstein.
Albert Einstein had a couple of close friends as colleagues at the patent office and as students. One of them was Michele Besso from the Zurich home of women. Another was Joseph Saunter from the patent office. He had one more very close friend -- Lucian Chavan, the technical secretary at the Federal Postal and Telegraph Administration in Bern.

Answer 2

He was a loner, by choice. These are all from his wikiquote page:

The first quite I'll mention was a response he sent an unemployed musician in the same year that Hitler came to power and put a bounty on Einstein's head. (Eg, The year that Einstein became Public Enemy #1 of Hitler and the Nazis. [source: time [dot] com/Einstein-England]) He wrote:

"Bear in mind that those who are finer and nobler are always alone — and necessarily so — and that because of this they can enjoy the purity of their own atmosphere. "

Also

"I am truly a 'lone traveler' and have never belonged to my country, my home, my friends, or even my immediate family, with my whole heart; in the face of all these ties, I have never lost a sense of distance and a need for solitude...

"Although I am a typical loner in daily life, my consciousness of belonging to the invisible community of those who strive for truth, beauty, and justice keeps me from feeling isolated."

"... since early youth I have always __detached myself from family, friends, and surroundings__ ... What a miserable creature man would be if he were good not for the sake of being good, but because religion told him that he would get a reward after this life, and that if he weren't good he'd be punished. " -Einstein and the Poet, pg 104