There really is a lantana named 'Carlos' and I was thinking that it should be easy to come up with more names in this vein. Since I was planting cosmos seeds at the time, the first one I thought of was cosmos 'Kramer'. Here are some more my coworkers and I came up with during the day. Please add more.

spruce 'Willis'

dahlia 'Parton'

ilex 'P. Keaton' (or 'Rodrigues')

acer 'Diamonds'

hedera 'Sexual'

astillbe 'In Love With You'

rudbeckia 'Sunnybrook Farm'