Picking a name close to another family member

Anne
So I LOVE the name Thea for a girl. It's the only name I can think of. My husbands cousin has a 3 year old son named Theodore and we call him Theo. My husbands family is very close but we only this this part of the family about once a year. They live about 6hrs away. Do you think Theo and Thea are too close?  Do you think it's rude?