My first was turquoise colored, so I dubbed him Turk.
Second one, I wanted to carry on the color-inspired tradition, and he was more of a true blue, so I named him Azul.
Our current one, he isn't one color per se, and I felt like he was pretty unique, and his coloring reminded me of a sci-fi character we love, so we named him after that character- Ka D'Argo from Farscape. I'm tempted to get a tank started for a female for him, a steel blue and white one, and name her Chiana, after the character's love interest.
My bettas: D'Argo + the girls Jullanar, Lalla, Razz, Rayleigh, Aviendha, Arya, & Lovelylocks
plus the other guys Toni, Eli, and Clinton (platy, guppy, and molly) a kuhli- Burt, 2 yoyos- Duncan and Ma, and otos, Laurel, Hardy, Larry, Curly, and Moe, plus the kitty, Clara the Impossible Girl.
SIP: Turk (teal VT), Azul (royal blue VT), Jerrica Benton (pink cambo CT), Lady Amalthea (blue cambo CT), and Jadzia Dax (blue VT)