I like it. I have a cousin named
Abbie Tamsin. I'm not overly keen on alliterative initials, but it ultimately depends on the surname. If it begins TA or ends IN then no.
Tamsin CallaTamsin NoelleTamsin DionneTamsin RobertaTamsin RebeccanneTamsin ZaraTamsin HarmonyTamsin ClematisTamsin HazelTamsin Amber