LOL. Aga-chan has more knowledge, so it's okay.
i'm slowly learning.
but as for me, i go by Ohkura. i just like how it looks like, versus Ookura & Okura. somewhat of a shallow reason, but yeahhhh.
but for 大塚愛, i like Otsuka Ai versus Ootsuka Ai. but i had to type "oo" to get the correct kanji.