Rhaelyn Is A Feminine Name With Greek And Welsh Roots. This Name Acts As A Blend Of The Greek Name Rhae, Meaning “flowing,” And The Welsh Name Lynn, Meaning “lake,” “pool,” Or “waterfall.” Water Can Make For Lovely Inspiration For Your Little One, Whether They’re Closer To A Strong, Ripping Current Or A Still, Peaceful Pond. If You Want To Inspire Baby To Go Wherever The Wave Takes Them, The Name Rhaelyn Will Make For A Crystal-clear Choice.