No I don't think so. If you were outside yelling each of the names, they would know which was which. Now a Caden and say a Grayson might be too close, but the "L" sound in Kellan is distinctly different from the "a" sound that sticks out in Caden.
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Re: Are these names too close?
I think they are a little similair. However...I"m in the camp that you should choose a name that you both love!
*BTW: I LOVE the name Kellan
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