Things to notice
1)All the saiyans are named after vegatables.
2)Freezas family are all "cold" related.
3)The Ginyu Force are named after dairy products.
4)Piccolo and all of his offspring are named after instruments.
5)Bulmas family are named after underwear.

Saiyans
Kakarotto - carrot
Goku - "ku" japanese for sky
Radditz - "raddish"
Goten - "ten" japanese for heaven or afterlife
Nappa - chinese for "cabbage"
Gohan - japanese for "rice"
Bra - women's bras
Pan - pun on "bread"
Trunks - boy's underwear
Vegeta - "vegetable"
Burori - "brocoli"
Taurus - a bull call
Paragus - esparagus
Saibamen - Plant men
Bardock - Root

Earthlings
Buruma - bloomers, japanese for women's underwear/shorts.
Marron - marron, japanese spelling of the french word.
ChiChi - breasts
Pilaf - pilav, japanese for rich dish
Dr. Briefs - men's underwear
Yamucha - "dim sum" in chinese
Chaozu - chinese for "gyoza": stickers
Lunch - self-explanatory
Tenshinhan - fried rice
Puar - chinese pun of "puh er" a type of tea
Kuririn - japanese for "chestnut"
Oolong - chinese for "wulong": Amber Tea
Videl - "devil"
Mr.Satan - satan
Lucifer - Pun on Satan's angelic name
Muten Roshi - filter paper
Sharpener - a pencil sharpener
Butter - butter
Udo - wood
Supa Man - a pun on the man of steel
Jewel - a shiny rock
Cocoa - cooking ingredient and winter favorite
Killer - murderer, killer
Shura - fighting
Hacchi - a bowl
Ginger - a spice
Udo - wood
Shura - fighting
Supa Man - a pun on the man of steel
Cocoa - cooking ingredient and winter favorite
Hacchi - a bowl
Hasukii - husky, fat
Jewel - a shiny rock
Jinku - Lively song
Kakao - seed used to make cocoa
Killer - murderer, killer
Bun - Pun on a type of bread
Butter - butter
Emi - Japanese for smile
Dr. Kori - koori is Japanese for ice
Dr. Kochin - kouchin means wages or pay
Captain Chicken - Pun on his name came from the fact that he ran away after seeing Vegeta's strength
Akkuman - Aku meaning evil
Dr. Willow - Wheel
Bacterian - bacteria
Uranai Baba - fortune telling old woman (Baba)
Chindai Ken - Great Pekinese emperor
Chinshyou Ken - Great Show emperor
Grandma Hakkeke - clothe used inside cuffs
Jackie Chun - Jackie Chan
Ikose - pun on ikousei meaning transitional
Kaizoku Robo - Robot Pirate
Maron - chestnut
Papaya Man - a papaya
Karin - Quince. Quince is an apple-like fruit.
Kid Katsu - Katsu meaning cutlet
Kokuou - king
Mai - linen robe

Nameks
Piccolo - flute
Drum - drum
Nail - pun on "snail"
Cymbol - a cymbol
Dende - japanese for "denden mushi"
Piano - a piano
Tsuno - japanese for "horn"
Tamborine - a tamborine
Kami - japanese for "god"
Kargo - escargo
Slug - a slug

Freeza
Cooler - a cooler
Gurudo - "yoguruto" japanese for yogurt
King Cold - cold
Jeice - "cheese"
Freezer - a freezer
Burter - japanese for "butter"
Kui - a chinese fruit
Ginyu - japanese for "milk"
Dodoria - pun on "doria": japanese for tasty dish
Recoome - cream
Zarbon - a japanese fruit
Raspberry - a fruit
Blueberry - again, a fruit
Garlic - Garlic
Garlic Jr. - Same as above
Ginger - spice
Vinegar - vinegar
Nikki - diary; journal
Cashew - a tasty nut

Buu & Cell
Bibidi - pun on Cinderalla: bibidibabidibuu
Babidi - same as above
Buu - same as above
Cell - a cell