| Big name in IM | 14 |
| Big name in imaging technologies | 32 |
| Big name in immunization history | 32 |
| Big name in in-flight wifi | 26 |
| Big name in in-vehicle security | 31 |
| Big name in India's history | 31 |
| Big name in Indian politics | 27 |
| Big name in Indy racing | 23 |
| Big name in inflatable beds | 27 |
| Big name in infomercial gadgets | 31 |
| Big name in infomercials | 24 |
| Big name in inns | 16 |
| Big name in insomnia medication | 31 |
| Big name in insurance | 21 |
| Big name in intelligence | 24 |
| Big name in international shipping | 34 |
| Big name in investing | 21 |
| Big name in IQ tests | 20 |
| Big name in IRAs | 16 |
| Big name in Irish crystal | 25 |
| Big name in ISP's | 21 |
| Big name in ISPÂ’s | 21 |
| Big name in IT | 14 |
| Big name in Italian fashion | 27 |
| Big name in Italian fashion design | 34 |
| Big name in Italian handbags | 28 |
| Big name in Japanese electronics | 32 |
| Big name in Japanese photography | 32 |
| Big name in Japanese semiconductors | 35 |
| Big name in jazz | 16 |
| Big name in jazz sax | 20 |
| Big name in jazz singers | 24 |
| Big name in jazz-singing history | 32 |
| Big name in jeans | 17 |
| Big name in jewelry | 19 |
| Big name in jewelry retail | 26 |
| Big name in juices | 18 |
| Big name in jumping | 19 |
| Big name in ketchup packets and plastic forks | 45 |
| Big name in ketchup packets and such | 36 |
| Big name in ketchup packets and the like | 40 |
| Big name in keyboards | 21 |
| Big name in keyboards and motorbikes | 36 |
| Big name in kibbles | 19 |
| Big name in kiddie lit | 22 |
| Big name in kids' construction | 34 |
| Big name in kindergarten | 24 |
| Big name in kitchen appliances | 30 |
| Big name in kitchen foil | 24 |
| Big name in kitchen gadgets | 27 |
| Big name in kitchen gadgets seen on infomercials | 48 |
| Big name in kitchen products | 28 |
| Big name in kitchen utensils | 28 |
| Big name in kitchen wrap | 24 |
| Big name in kitchenware | 23 |
| Big name in knives | 18 |
| Big name in kosher products | 27 |
| Big name in labels | 18 |
| Big name in laminate flooring | 29 |
| Big name in lanterns | 20 |
| Big name in laptops | 19 |
| Big name in late-night | 22 |
| Big name in late-night talk | 27 |
| Big name in late-night TV | 25 |
| Big name in law and legerdemain | 31 |
| Big name in lawn care | 21 |
| Big name in lawn care products | 30 |
| Big name in lawn equipment | 26 |
| Big name in lawn mowers | 23 |
| Big name in lawn products | 25 |
| Big name in LCD TVs | 19 |
| Big name in lease-to-own furniture | 34 |
| Big name in leather bags | 24 |
| Big name in leather goods | 25 |
| Big name in lemons | 18 |
| Big name in lens care | 21 |
| Big name in lenses | 18 |
| Big name in lexicography | 24 |
| Big name in library science | 27 |
| Big name in light planes | 24 |
| Big name in light verse | 23 |
| Big name in lighters | 20 |
| Big name in lighters and pens | 29 |
| Big name in lingerie | 20 |
| Big name in links history | 25 |
| Big name in liquid bandages | 27 |
| Big name in liquor | 18 |
| Big name in lithography | 23 |
| Big name in little blocks | 25 |
| Big name in little books | 24 |
| Big name in little candy | 24 |
| Big name in little cars | 23 |
| Big name in little stories | 26 |
| Big name in little suits | 24 |
| Big name in little trains | 25 |
| Big name in little trucks | 25 |
| Big name in lock-changing | 25 |
| Big name in locks | 17 |
| Big name in London | 18 |
| Big name in low-stress camping | 30 |