I'm still torn on this particular issue. I take this aspect of conversion very seriously because, as far as I'm concerned, it's a fresh start - a second chance so to speak, and this is the name through which God will come to know me. I've narrowed my patron/name down to a shortlist of four:
1. St. Basil the Great - As a William, the congregation and Russian friends I've made through them already refer to me as Vasily. Basil of Caesarea thus came up simply as a phonetic convenience, but reading into his remarkable life and contributions to the Faith has given me a greater depth of appreciation of his life.
2. Tsar Nicholas II - I'm a huge supporter of monarchy - to the extent that absolute monarchy is my ideal form of government - and the last Tsar gave up his life in the fight first against liberalism, and then against the Satanic forces of Marxism which brought death and destruction on an unprecedented scale to Russia. It was an interest in the Romanovs that started back in the 90s - when I was about seven or eight - that kicked off my interest in Russian history and politics, in turn leading me to my studies (I just completed a Masters in Russian politics) and career path in academia and, of course, Orthodoxy (directly or indirectly, he led me to the Faith). Family is also very important to me, and Nicholas was a model husband and father, made all the more pertinent as the royal and aristocratic milieu of Russia at the time was dominated by debauched individuals dabbling in spiritualism, drugs, homosexuality, etc. My only reservations is that at times I feel like I'm taking his name and patronage for the wrong reasons; I don't want to fall into the trap of that pseudo-cult in Orthodoxy that worships the last Tsar as a Christ figure and the sees fall of the Romanovs as some sort of redemptive killing.
3. St. John of Kronstadt - I had originally thought his Dec. 20th repose coincided with my birthday, but was looking at the new calendar. Still, his feast is near my birthday, and he's a proper clergyman and wonderworker whose sense of charity, spiritual writings, and support of monarchy and traditional society speak to me.
4. Patriarch Tikhon of Moscow - Similar to St. John, with the added benefit that he helped to convert and spread the faith in North America, giving me that regional connection, and vocally opposed the Bolsheviks when doing so quite literally got thousands of others killed.
I'd be very interested in finding someone who led a true ascetic and spiritual life - a St. Seraphim of Sarov, etc. - but I'm admittedly not keen on taking an archaic name like that, even if only for church purposes.
My priest said to pray for clarity. I have, but no one has spoken to me or given me a sign yet, so it remains to be seen whether I'm Vasily, Nicholas, John, Tikhon, or someone else.