Last name of Russian small-arms designer Mikhail T. Kalashnikov. His seminal design was adopted by the Soviet Army in 1947 (although not fielded for a few years) as "Avtomat Kalashnikova" of 1947, or, "Automatic Rifle of (by) Kalashnikov", abbreviated to AK-47. It is a milestone in firearms design, combining an incredibly robust, soldier-proof design with relatively light weight. The ergonomics, like many Soviet-era designs, are somewhat lacking. The rifle is chambered for an "intermediate-power" cartridge, the 7.62x39mm, which is comparable to the 19th-century .30-30 Winchester. In 1959, the design was modernized and upgraded and the name changed to AKM (Avtomat Kalashnikova Modernizirovannyj; Automatic rifle of Kalashnikov, modernized). This design and its various folding-stock versions was standard issue for all Warsaw Pact countries until 1974, when it was modified yet again to take a new (and arguably less effective) cartridge, the 5.45x39mm, and became the AK-74. All of these rifles are generically termed "AKs" or "Kalashnikovs".
Mikhail Kalashnikov, while a Hero of The Soviet Union, made exactly zero money from the 50 million or so AKs made, and owns no part of the Ihzvesk plant that currently makes the bulk of Russia's AK models.

One who has a mania for music.

A card game created by the YouTuber Life Of Boris where 2 players sit down and see who can build an AK-47 out of cards the quickest. Then they fight to the death by rolling dice or another more advanced way. You must get 20 points to kill your opponent.

Well known as the name of a Soviet-era Russian machine gun, a cocktail drank in many former Soviet countries such as Lithuania and Russia is named it after it.
To make the cocktail:
1. Fill a shot glass 3/4 full of vodka
2. Cut a lemon slice so that you may rest it on top of the shot glass covering half of the opening.
3. Put sugar (and cinnamon if you wish for more flavor, but the cinnamon is not necessary) on top of the lemon slice.
4. Fill the rest of the shot glass with absinthe, pouring it so that it passes over the lemon slice.
5. Light the lemon slice on fire.
6. After the slice has burned out, take the shot and eat the lemon.

Voila, a Kalashnikov.

One of the many guns manufactured by the Russian company owned by Mikhail Kalshnikov.

The Russian company that makes AK-47s, AK-101s, AK-102s, AK-105s, and the PKB APCMC (Amored Personnel Carrier Machine Gun).